Eh, Im not conservative but I do think this is a valid bipartisan criticism.
If they pulled this stunt with a liberal leaning byelection Id consider it a greasy trick.
I have no issue with putting a cap on ballot names via some kind of reasonable system (IE if you get more than x candidates, then the top y candidates can only go on the ballot based on who has the most vouches or whatever)
That way you can avoid dozens and dozens of randos flooding the ballot to confuse people. It's a valid hole to patch in our system that both sides should be on board with fixing in a reasonable way.