I think they would lose a ton of customers getting FF if they restricted it to 10:00 PM entry. If they did that, it would suck but I would likely just completely forego HHN and go to HoS SeaWorld instead.
I may be completely off base here (please correct me people that know better) but I feel like they have cut capacity in several different areas. Kid zone closed, multiple bars and pop ups gone, removing food and bar space at existing pop ups, no shows at all, not using the Shrek (Villain-Con) House for anything this year. I haven't really seen any kind of Street shows either but I've only been 2 nights and haven't followed along to close with the rumors and what is actually available.
After living through the IoA years, I really don't want to see it come back. Too much walking and it really doesn't lend itself too well.
I really like the Meet & Greet
@SeventyOne brought up, and I bet you can find plenty of empty space that you could use for them: Horror Make Up or Bourne, Central Park, Knockturn, Peacock bar (RIP Secret Bar), the area next to Horror Make up.
Additionally, they could potentially add meet n greets for the fan favorite characters from this year's event which would help curtail the people that clog the zones, crowd the characters, or harass them. Batricia being the obvious one I'm thinking of this year so far. But maybe had they done something like this, we could have avoided the issues with Tiffany and some of the others that got really out of hand back in the day.