Googler here (community engagement for Android) - I looked into the developer options question, and it's my understanding that you don't have to keep developer options enabled after you enable the advanced flow. Once you make the change on your device, it's enabled.
If you turn off developer options, then to turn off the advanced flow, you would first have to turn developer options back on.
If I understand correctly, the F-Droid store itself would be possible to install without waiting period, as it's an app from a verified developer.
Would apps installed from F-Droid be subject to this process, or would they also be exempt? Could that be a solution that makes everyone happy? Android already tracks which app store an app originates from re: autoupdating.
Also: Can I skip the 24h by changing the my phone's clock?
Why can't stores take over the "verification" process (like they do already)? Why do app developers have to be verified themselves, why does the verification have to be done by google? There are so many options, why choose google of all companies? Just laziness?