I would not last 5 minutes.
I'm occasionally offline outside planes and the amount of times I pull out my phone to "google something really quick" is high.
You can already disallow apps without an MDM, but I'm curious what else you can do with it. I generally uninstall apps like Instagram so it takes a minute to even download it again, but it gives me a way to download it, post something and delete it once a week or so.
Ask your spouse or a friend you trust to set screen time passcode. You can’t bypass it and you’re not going cold turkey either or losing an important utility like Safari.
Doom scroll all you want in 2 mins then it’s locked for the day.
I have succeeded and it’s been 3+ months.
I tried that app briefly to organise my pages, and not only was it stiff and awkward to use, it decided to screw everything up and reset positions.