The only problem is that it uses a 4 digit passcode. If I set the passcode myself, I can always override my app limits by typing it in when I hit my limits. I could ask a friend or partner to set the passcode for me, but that felt awkward.
So I built WaitToUnlock.com. It's a simple website that generates a random ScreenTime passcode and guides you through entering it in a deliberately confusing way (for example: "enter 3, enter 7, delete it, now enter 5..."), making it very difficult to remember the final code.
The passcode is then securely stored away. If you need it back, you can request it, but you have to wait at least 6 hours before it's revealed.
That way, you can still get your passcode back if you really need it, but it removes the ability to override the app limits the moment the temptation strikes.