The root problem is much deeper and I think it’s difficult to address without behavior change (which is hard). Making it very difficult to do is a good compromise while you’re also working on building self control. These phones take that difficulty to a new level so long as you’re away from your other devices.
I’ve found productive addictions include things like ear training, Duolingo, etc - they replace the tactile sensation and give you that quieter time to yourself but at least you’re learning.
It's still perfectly possible to just not open them/log in, obviously.
Typically, "uninstallable" apps can be disabled via adb commands if you don't want to (or can't) flash a custom ROM. Sometimes they can't however - for example, Amazon sells subsidized phones that display advertisements on the lock screen.
This isn't a problem if you have a rooted device, but root is difficult/impossible to obtain on certain devices (like Samsung's Galaxy 8 onward) due to enterprise level tamper-proofing.
Having said all that, I just got an unlocked Pixel 4 and it has zero of that bloat. If you happen to consider the Google services themselves bloat/tracking (they often are), rooting is fully supported which allows you to install an Android distribution without any Google services.