Overall, this new system seems like a big improvement to me.
Disney is in a tough spot here, largely because there is so much demand that the parks are just too crowded for their ride capacity.
Allow too much advanced planning, and people will complain that you have to wake up at 6AM and know exactly what you want to do months in advance.
Allow too little advanced planning, and people will complain that they couldn't experience the attractions that they wanted to without spending their entire vacation standing in line.
Make it too complex, and casual guests will feel overwhelmed and complain that you need a PhD just to go on a Disney vacation.
Make it too simple, and savvy guests will find every possible exploit and loophole to get as much value as possible.
This seems like it threads the needle reasonably well, eliminating some of the chaos of mid-vacation scrambling without requiring months of advanced planning, and also giving some advantage to on-site guests and those with longer stays.
I've yet to pay for
Genie+, partially out of spite, and partially because we can usually accomplish what we want to with careful rope-drop strategies and longer trips. I also haven't been willing to spend that much money and then roll the dice on what I would get for it, nor do I want to spend the whole day with my head in my phone. But I may actually spring for this in early August, if I can plan ahead and know what I'm getting.