The idea of tablet computers is actually quite old and it has been tried a couple of times, at least up to prototypes. Probably a certain level of hardware and software was needed to make them both useful and affordable for enough people to become a mass product. This is actually a quite common thing. Some person, group or company has invented something really good, but they were not able to provide a sufficiently reliable, useful and affordable product to the market or just were not able to leave their home market efficiently. There are just a few examples for this, that I have observed.
- Tilting trains have been tried in Germany, UK, Italy, Spain, Sweden Switzerland, Canada, France and Japan, in some countries several times. Many efforts become dead ends because the technology was not easily built in an affordable and reliable and maintainable way, so the mechanism was disabled or the trains were put out of service way too early. Italy actually made this technology work, but some of the train sets suffered serious deficiencies in quality, reliability and maintenance. Spain did the Talgo, which is less ambitious, because it uses gravity instead of an active mechanism and provides for a weaker effect. Sweden developed the X2000 trains, which seemed to work more or less well, but were quite expensive. But finally it seems that companies are able to produce good trains with this technology, like the relatively new Swiss ICN-trains.
- A British company had produced trailer bikes for children already in the 1930s. They have one wheel and are attached to a parent’s bike. These were hard to get and they were almost unknown, even though the idea is great. In the 1990s German companies started to adopt the concept and actually produce them in good quality and sell them internationally, which was off course easier than 60 years earlier. They are now a common concept.
- In the 1970s many bicycles had three speed hub gears. Derailleur gears already existed, but they were hard to use and fragile. For steeper roads it was possible to use a larger sprocket and to be able to climb slopes at the expense of lacking higher gears for flat sections. A British company produced a 5 speed hub gear, but it was extremely difficult to get and the quality was so poor that it would be almost half of the time in repair for a more active cyclist. Today we see mature hub gears with more than ten gears, but the derailleur technology has also become mature enough for the main stream.
So there are several requirements to success.
Another interesting aspect is that the actual usage might become different than anticipated. I understand that the tablet computers where sold as a „better replacement“ for PCs and Laptops in certain areas. I do not think that this is reasonable. Having a keyboard and a larger screen is usually better and it makes sense to transport a small or even a larger laptop. I have often had an external keyboard on top of the laptop, when I could afford to transport it and anticipated a heavy use. The netbook was so small that it did not hurt to have it in the luggage, but it was eventually hard to expand the memory and to get a replacement. A relatively small laptop still serves the purpose when a real computer is needed, but luggage is constrained.
The tablet computer does have some features that make it worth having one on top of a good phone and different sizes of Laptops. I am using an Android tablet, which is the most common OS for tablets, but there are off course some others, which I do not know well enough to write about them.
It is easier to switch between keyboard types. I am using the Cyrillic keyboard a lot and the computer with which I am writing this text has two external keyboards attached. I can switch with a key sequence, but this approach has its limitations. Probably buying a Laptop in Russia and just knowing the German keyboard without relying on the symbols on the keys would work for me. But the tablet makes this work with very little setup, while buying a physical Cyrillic keyboard in Switzerland is a bit harder, but still easy and buying a Laptop with Cyrillic keyboard layout does need some effort.
When doing small stuff, mostly reading or even some smaller emails, this is much better than the phone, but it can be used in the train, in the park, anywhere, where it is possible to sit. A laptop requires some kind of a table to be reasonably useful. There are seats with tables in the train, but that is a matter of luck to get one.
Finally we currently have a lot of Android Apps. They could be written for „normal“ desktop Linux as well or as web applications. Maybe that will happen. But currently some of them are available for Android, but not or not in a useful way for desktop Linux. This may change and it heavily depends on what we are actually using. But in my case it is true and it proved to be helpful to have the larger screen than on the Android phone.
Concerning the SIM card, I actually went the extra mile in terms of higher price and more effort for buying it in order to get a SIM card slot. I have not used it very much, because the extra SIM card is kind of expensive, moving SIM cards between devices is inconveniant and using the Android phone as a WiFi-Router seems to work well enough. But maybe this is useful when travelling a lot with SIM-cards from many countries to use just all the slots in older and newer phones and tablets and to use the device with the currently preferred SIM card as the WiFi router for all the others.
And finally it can be said that we can now buy fairly affordable good tablet computers. What I am missing is that tools from desktop Linux are usually not available on Android or only in a limited version. But the most common applications, a web browser and an email client are off course working on both…