Tablets are completely different than Readers. A tablet relies on apps and the OS. If the OS cannot be updated than the apps versions will be whatever the last version to run on that OS and if a new version comes out for a newer OS, then you won't be able to use it.
Kindles are similar in that you won't get any new features for the old models. Yes, they can handle Mobi and that's fine. But that's also holding back progress. Amazon should be allowing KF8 only eBooks to be published. There are things that don't work on Mobi that cannot be back ported or won't work well enough.
My Sony Reader PRS-T1 still works and it still allows me to read ePub. But, it's slow and the version of ADE does not have hyphenation. So what that means is that if I was still using the T1, I would have to put up with a screen not as good and missing features that I do want.
But, Amazon is stifling eBooks from using features that would make them better. I've seen ePub that is better formatted and the KF8 version is not as good because the publisher removed things because of Mobi.
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