I’m honestly mostly content with Epcot at the moment.
SSE and Figment obviously need work, especially Figment, but in terms of expansions or additions, it could use an extra E-ticket or two, but it would just make a great park greater.
Definitely could use some more, but it needs it the least, imho.
I do think DAK needs love the most, its ride lineup is just so shallow (yet so elite), but if Animal Kingdom doubled its ride-lineup, it’s honestly a more-chill Epcot. I absolutely love Animal Kingdom, but I hardly visit it since I only ever find myself spending a few hours there at a time (whereas I can spend every weekend at Epcot).
I’m not sure if HWS or Magic needs more first. Both have severe capacity issues, but MK continues to lack a stellar modern headlining E-ticket. It’s embarrassing imho. It’s still a great park, but since so many people will only do one day at MK, it needs to represent the resort in a better way.
How is the park better for families with very young children since the 80s? I’m likely (and hopefully) something, but if you exclude all thrill rides or coasters, the only new dark ride is Ariel? They removed Snow White, so I guess they’ve added a few meet and greets and the Aladdin Spinner, but Magic needs a slate of a few new family dark rides. It basically needs its own Fantasy Springs.
Hollywood Studios probably needs more than Magic, but it’s mainly because it needs to replace existing ugly and add 2 complete lands. What’s there is great, but there’s hardly anything there. Difference with Animal Kingdom is there’s a lot of ugly, attendance is high, and capacity is low, so solution is multiple new lands, whereas Animal Kingdom can probably get away with almost exclusively new attractions (which means it would be cheaper to fix).