You’re talking of the eternal tension between security and freedom.
No, I don’t think that reducing choice and locking them in Google’s ecosystem is pro-consumer, even if done for the right reasons.
Let’s remember that Android was welcomed by many of us as a free (as in freedom) alternative to iOS.
If you want a locked-down, secure and polished OS, then Apple’s iOS is far better at this game. The only reason why Android is dominating the market right now is because it gave freedom to users and freedom to phone makers. And Google dialing that freedom down after becoming so popular is anti-competitive.
It’s essentially a bait and switch, which is why I believe Google deserves that fine.