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The main part of that post is about different DRM schemes dividing the market, and making EPUB books incompatible between e-readers. I fully agree.
That, however, is not the fault of the EPUB format. If you have an EPUB file without DRM, or one of which DRM has been removed, it should work on all EPUB-capable hardware.
AFAIK as I know, the only EPUB format that differs from the default EPUB standard is Kobo's KEPUB. Kindle's KF8 is, I think, also based on EPUB, but with differences. In the end, that doesn't matter though, as long as there is a program that can convert from EPUB to whatever format my current reader uses. In the past, that was a Kindle with KF8, now it's a Kobo using KEPUB, and both are sourced from standard EPUB's in my library; and both display without problems.
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