Apple Screen Time will occasionally stop blocking applications, allowing the child account to use them without restrictions.
Other drawbacks include only a single period of "down time" per day. There is also an inability to totally block applications; the closest analogue is to set a maximum of one minute for the website or application.
not just occasionally but often, in our experience with multiple phones and iPads. I have 2 kids with devices and have found Screen Time completely useless. It is the right idea in theory but in practice it's broken (I'm guessing no Apple higher ups have young kids that they've tried to use this with.)
Also, besides the resets (and by reset I mean not just time restrictions but content restrictions too), my kid can just bypass it by entering his AppleID password.
For this reason a configuration profile [1] is the only fool proof method. However, I have only used them to deploy permanent content restrictions. I don't know of a way to enable or disable restrictions based on the time of day or a certain duration.
Other drawbacks include only a single period of "down time" per day. There is also an inability to totally block applications; the closest analogue is to set a maximum of one minute for the website or application.