As far as drops, this site calls them ride refills.
Parksavers I actually didn't read this before my trip... Just played the refresh game.
I'm probably pretty strange in that my preferred return time is basically always ASAP. So the difference in G+ not allowing you to pick a time never bothered me in the slightest, however i acknowledge that this is a downgrade for a lot of people. I was always going to take the earliest option on FP+.
You are correct in that you can only book 1 vs 3. This is certainly a bad thing for those staying onsite, but probably a good thing for those staying offsite or booking a last minute trip. It makes the system more equitable and "hurts" people that posts on a Disney thread. While helping people that didn't plan, have as much knowledge, or experience the system before. I can see your argument why the planners should continue to get a big advantage, but ultimately I disagree with it.
I highly suggest you watch the defunctland documentary to see why FP+ was such a problem.
If you don't have that much time (I don't blame you). Start at the 1 hour and 15 second mark.
I miss FP+. I got on more rides than is possible with G+. In my MK day in 2019 I skipped 14 lines. In 2022 I only skipped 10 lines. Those extra 4 skips I didn't get to use were used by someone else that would not have used them in 2019 (because I took them). This seems like a more "fair" system to me even if ultimately I loose out.