Personally I can see both arguments. however, something I think is missed is that classes that people are dropping to run this vehicle probably weren't as desired as people thought they were. You don't exactly drop your favorite class if you run multiples for something else, in general.

To me at least, it seems easy to be against something when its not something that you want.

Personally, I try to keep an open mind on these things and look for whatever improves turnouts as in general I am seeing that people who start in RC racing and like it usually end up with more than 1 vehicle to run. If this vehicle is like the whole SCT craze that seemed to pick up with the slashes get that going, its a plus in my opinion overall for the hobby, as we need more turn out in general.

Lastly, maybe what tracks need is just 1 class that is a catch class for new vehicles and / or vehicles that just don't fit into current classes. Anything that doesn't fit into a certain class you can run there. And then at periodic points, review turn out for all classes. If the catch class has significantly more turn out of that particular type than another standard class, then maybe they swap out the failing classes with the ones that are growing. Still allows vehicles that are effectively the odd balls the ability to run, while stuff that is getting the turnouts its proper place to shine.