I don't get it either. Their products are solid and sell well. It doesn't make any sense for a developer to be a platform purist, that's a quick way to become obsolete and wind up collecting unemployment. In 10 years of software development I'd say 80% of all the APIs and platforms I've learned and developed for I could just ball up and toss in the trash as they aren't even relevant today.
Mostly I think it boils down to human nature, "us vs them". You see it in you tube comments with the brain dead "MACS CARNT PLAY GAYMS DDUUURF" comments, you see it on amiga sites where it's "how dare they have actually had competent management! How dare they not fail on a wave of bad marketing, canceled projects and unnecessary products! FREEEEEDOOOOOM". Except with the Amiga lunatics it's worse, a combination of Severe jealousy and bitterness, powder coated with the usual.
For an actual software developer to think that way is like getting to choose between your own weight in gold, or to ignore it and play on train tracks instead. Absolute lunacy.
EDIT: I just spotted he's a palm user as well. Yep, bitterness and jealousy.