Very true, but I don't think offering a lower kv motor in buggy size would worsen such matters. The "knowledgeable" people would buy the lower kv version, and the others would continue buying the 2650, which still isn't too demanding on 4s. The fact that people may try to put the 1518 and 1520 size motors in buggies, for less power or higher voltage and the same power would be worse.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy