I held off on Windows 10 for as long as I could until Adobe, and therefore my job, required it. Now this nonsense. I hope this isn't the start of them joining on the web DRM bandwagon.
What's extra stupid about these, is most of the time just using a user agent switcher to make the site think you're on chrome or opera makes it work just fine.
I do understand it. These are browsers that they decided during development that are not supported. Not supported means not tested by a full QA team for months. And users are generally stupid, soba simple warning (use at your own risk) is something that does not work.
So they decide to just not support the other browsers.
To be clear, I am definitely not a fan of Adobe of this mechanism, just explaining.
You can say browser X may cause issues on the website, but people will still complain that browser X doesn't work properly and demand you to fix whatever issue they're having.
Sometimes it's as simple as something like "firefox doesn't support import maps", but now they do (in 108+) but nobody has the time or inclination to go back and validate that the site now works in firefox.