Even the lack of ad-blocking in the browser I find beneficial, because there is practically no way I can tolerate the web without ad filtering, so I use it mostly for utility, not much for leisure.
Trying to switch back to Android recently, and I find that the instant responsiveness, the virtually unlimited selection of great apps, means that its a lot more likely to turn into a time sink for me.
I also spend more time on it when I haven't slept well. I'm happy to do other things when I'm rested but when I'm tired I don't want to do anything, and apparently looking at my phone meets the criteria for not doing anything.
I'm considering getting a dumb phone for on-call and talking to my friends/family...but if I wanted all of that other functionality I could just delete the apps that are addicting off of my phone.
Then you can use maps stored on the device and get a modern camera and lots of storage and so on but you aren't constantly checking apps for notifications and whatever.