A good question.Kish, what is your response to the fact that japes heavily promotes camping? Haing the stages split into 3 platforms like that means that certain styles of camping on the side platforms with some characters would be ridiculously powerful.
Nevermind the klaptrap, but have you considered this as a fault of japes?
Actually, its the other way around. Nationals have a tendency to deviate from the standard and then create a new "standard." Nationals actually have a tendency to go against the grain, and in doing so, progress is made.
The side platforms are a unique feature that certainly are powerful in that way. Three points:
1. To camp, you must first earn a lead, which earns you the right to maintain a more powerful position
2. Japes does a relatively good job, though imperfect, of forcing interaction in the crossover
3. As a last resort, characters who are not good at handling this environment would ban this stage
I agree that it favors certain types of characters over others, like any stage, but I think more than a few characters are viable. And as for people who main the others, you either switch to a secondary or use the ban-hammer.
Also on your note about national stagelists setting the standard is ironic. MLG actually took FC's ruleset and then propagated that as the standard. It appears we have come full circle.