> Do you trust google to treat non-AMP pages the same as AMP pages?
Google clearly doesn't treat AMP and non-AMP pages the same way: only AMP pages are eligible for the carousel in Google search, and there's a little icon.
Once there's a way for non-AMP pages be safely preloaded I would be very surprised if Google search didn't start doing that, though. (Speaking only for myself, not the company.)
If they don't/won't, no matter what your justification for why is (you believe it will provide speed, security, whatever), that's one of the walls.
Sure, you can not use it, but does that limit your ability to be found on the internet? If yes, then there's that wall again.
They're in the extend stage of Microsoft's favourite strategy.