Yup. Exactly the same situation as with MS-DOS 30 years ago: it was basically impossible to use Compaq DOS on IBM PC or IBM DOS on anything except genuine article.Hmm, sure on this? My first PC was a Printaform (Mexican reseller of Acer). I am sure to have run on it MS-DOS 2.11 and PC-DOS 3.0 seamlessly. Around 1987.
Please read what you wrote! 30 years ago … Around 1987. That's four years difference, you know. Period of time when MS-DOS system were well and truly incompatible was quite short and turbulent but by the 1987 it was already more-or-less history, you only were able to find traces of it by configure options of various programs which had knobs for "not 100% IBM PC compatible" devices - and it looks like we are already starting to experience the same with Android (here and here, for example).
"History does not repeat itself, but it does rhyme"*That* is a quote I expect to steal!
Don't forget that you are stealing from Mark Twain, not me! This phrase is so famous and well-known that I felt no need to even attribute it…
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