Like it get that remote work is wayyyyyyyyy better and RTO sucks, but let's not make up lies
What the hell does "physically possible" have to do with anything? Did you ever go to school? The doors may not be locked, but unless the school has some kind of defined pre-care program, they're not ready to take care of random kids dropping in early. That's why they have a start time.
My kids' school has a 20 minute drop off window. They have an pre-care option, but you have to sign up for it (and pay) because they have to juggle staffing levels. You can't just physically dump your kid outside the door and leave because you'd like to.
This may be easier for you understand: A store opens at 9AM, but you're available at 8AM and have to be in the office at 9AM. Can you just drop in at 8AM to get your shopping done? No, if the employees are even there, they're busy with "getting ready for the day" tasks. Same thing goes with schools.
Depending on when you have to leave for your commute, the doors may well be locked. And doors being unlocked does not mean you are allowed to leave your child there without ramifications. Again -- leaving a child in a school building without agreed-upon supervision is still a clear display of negligence.
Anyway, these are not serious solutions.