Agreed, I was also looking into DDC/CI for input switching my 2017 XB271HU, and mine works for brightness but definitely not input switching. Meanwhile my 2019 HP Z27 supports the full protocol, so I had to drop the idea
I literally use Apple devices for everything except my gaming desktop, but I can't defend for Apple in this case, and for the game streaming block.
It's like if Apple built houses, it would make no sense for them to force house owners to only buy furniture/services from Apple verified entities and take 30% of the cut. The most it should be able to do is just provide a list of services it thinks are safe to use.
I would ask why can't Apple just allow other app stores, and just say any apps not from "the" app store may not be secure. But ultimately it's probably just because Apple doesn't want to let go of the ridiculous 30% cut, since if other app stores had a lower cut, why would developers release on the official app store.
IIUC, any rogue high-level access employee could take over any account and post anything? Like make trump's account post "nuke inc @nk". I'm not sure if that's any more reassuring than just saying they got breached