I help run a local track here in central Texas & my point of veiw is that we're not wanting slow the cars down as much as make racing better across the board for our racers. Trust me every time I bring up slowing the class down I'm meet with resistance. But I push forward with new rules for one main reason....
I want all my racers finishing races. I watch a class over a year or so & when I see half the field dropping out (car breakage) and the driver seems overwhelmed I slow the class down. They always complain that's it's to slow at first but once they run it and they see that is fun having all 10 cars finishing & finishing on the same lap they are happy with the change. If they want speed I tell them to run a faster class. We offer mod at our track for those guys.
That's what work for us at our track.
Just one point of view from a track tech guy.