Because Acer, Asus etc could simply come along and undercut them on price and still have access to the exact same game catalog. And then they would each decide to add more proprietary features or add more performance.
And so you've just recreated the PC gaming market again.
What's the issue with that?
Developers certainly have no problem making PC games.
Can you say the same about buying any PC? Will that be true for any game you buy for the next five years?
That will be a much better experience for me as a consumer.
There is no need to open up consoles. You don’t have to buy them. The PC is incredibly healthy as a gaming platform.
Please let people like me who want to gaming appliance have it without screwing it up.
Besides, even if someone somehow forced, say, PlayStation to be cross-compatible with other platforms for some reason - it's not like the issues you described are exactly plaguing PCs nowadays. With very rare exceptions (like ancient or heavily modded games), the experience is pretty much "Press 'Play' on your launcher of choice -> Play game".