Warmers sounds like a safety issue to me. I decided to go for warmers for track days because I did not want to run on cold tyres, nothing to do with being quicker just wanted to reduce the risk of falling off. JMHO.
I guess the idea is to "level the field", and there is a risk that for every thing you allow you risk it becoming too expensive to stay competitive. People with money will do everything they can to improve their chances and those on a tighter budget struggle to stay competitive?