But that's not all phones, is it. If you buy your phone directly from Google, you made a mistake. Like buying one from Apple. If Google want to continue to claim Android is open source, they have to allow for devices that forego any of this crap and boot vanilla non-Google-Services Android. And if you're privacy oriented enough, you will give up on apps that are not.
And given enough time somebody is going to work out how you fool a modified system into booting. The problem is legal. Depending on where you are circumventing any digital locks can mean jail time at worst. We have to address the legal situation at the same time.
Google has a vested interest in keeping Android open source. Because the moment they turn away from that more antitrust action is going to hit them like a ton of bricks.
What's an "important app" to you here?