Oh, and to discuss "facts":
I want to start by admitting say that I do not know whether the compatibility issues are the fault of the game devs, or the fault of the itch devs. That's why I offered the game devs the resources to make sure things were done correctly on THEIR end. Issues cannot be fixed if don't know for certain WHERE the issue is. If the game devs have checked and double-checked that they have done everything THEY can to make their apps compatible, then we can say for certain that the issue lies with the itch devs, and can then properly get support for those issues, through the right channels.
Either way, users shouldn't just... expect such issues. Why is everyone so resigned to the idea of using a CLEARLY broken system?
Itch.io is a game library. The WHOLE point of a game library is to have an accessible collection of games. A bunch of games, all in one place. If a game library requires people to go to OTHER sites to access and/or manage the apps shown in THEIR store, then it fails its entire purpose as a game library. Similarly, if a game dev uploads their game to a game library in such a way that it requires users to download their game from a site other than the game library to which they are posting, then they don't want a game library, they want a game blog.