You say "better" so objectively.Not dramatic at all. It’s not just the RoA, and it’s not just MK. It’s a collective amount of decisions across MK, HS, and Epcot that are making the parks interchangeable and less and less thematically unique. That doesn’t make them six flags level (that is to me, dramatic) but yes, makes it closer to the Universal model pre-Epic; just the IP flavor of the month and wherever they can throw it. Don’t get me wrong, IoA is still a good to great theme park, and USF has been a good park as well in times past. But Disney can, and used to do better.
I like a lot of the changes they've made and wish they would do more. I love what Tokyo is doing right now. I hope they bulldoze their Adventureland, it would give a reason to go there.
Magic Kingdom is still strong thematically. Epcot too, they just changed what the front of the park stands for and some people haven't caught on to that yet. HS is the only park that's stuck in between.