As you said, the fandom always thinks they know how to do everything better than the people who are getting paid to do it.
This.
More people than you can count go into the industry thinking they can change things for the better and often do not succeed. Bottom line is that most of what these parks present don't really need to be changed as far as systems go and are just really dumb nitpicks by fans.
I am not saying everything is perfect, but some of the things people complain about are just bizarre.
On an opposite note, I have to say the layout of this park looks... interesting.
It's different for sure, but is it too ambitious? Will guests like to keep walking through that hub area to enter the different parts of the park?
Personally, I think I would get sick of it eventually. No matter how breathtaking or interesting it may look, the hub may be what brings this park down. If there are a healthy amount of attractions in there like some speculate, it may solve the problem of going through essentially what many might call a dead space, but it will still be annoying to drag through, almost like an obstacle. Just imagine if you wanted to go from Nintendo to Monsters and had to go through that hub. Then you might want to go over to Berk, so you go across the hub once again.
This will continue every time you want to move destinations in this park. Every. Single. Time.
Let that sink in...
There is a reason why parks are essentially circles, it's so you don't see the same thing over and over unless you turn around and go back.
Once you reach the same area in a park that you have already seen during that visit (if you are traveling in a straight motion all the way through like most guests.) it is usually near the front entrance or where you started. The Hub changes everything about the layout formula regarding theme parks.