You are right and wrong about that, all my rims and tyres have mesh lines(actually i never saw rims without them?? tyres yes) and the tyres tab that changes mesh according to rim width can be ignored as it also have a default rendertype(which can as well be ignored if you drop mesh and render on cfg).
Anyways the rims and tyres that lack these lines can be "easily" fixed, i guess - or anyway they'll not be scalable lol.
With so much drama in the V-S-T, it's kinda hard being Bigg B-O-double-S-ninetythree