Quite right. The tools are there to keep all the crazy high powered cars out, just set an HP limit along with your usual PP limits and you're done. PP only starts to go backwards with really high HP numbers, in the thousands, so setting a 450 PP lobby at 400HP for example, will allow all the "normal" cars in and keep the high powered hybrids out.
But some of the elitists get so bent out of shape they say stuff like, "I'm not pressing that extra button to keep the hackers out, I shouldn't have to..."...blah blah blah.