Pilots with LCA's do not have the necessary manuals to work out the brake cooling periods. They generally only have the 53 minute table to hand. They have to accept purely verbal assurances that wise heads in offices have worked the figures for rapid turnarounds to be legal.
Legal advisors to these companies would not be terribly impressed if they were ever to conduct an investigation - hopefully prior to an abort/over-run. An adversarial lawyer would tear them to pieces.
There are many other waiting perf/fuel/technical type chickens looking to roost amongst the rapid growth companies.