In the context of competent players, you specifically said that plenty of people play 5min bughouse. This is false and results in lengthy sitting.

I don't think you're getting that the way they are playing wrong is completely different than not being Kasparov. Learning to play like Kasparov would take ~20,000 hours. Learning basic time management would take ~15 minutes and make them easily twice as effective. Total ignorance is a poor defense against this -- and won't last given they want to hold a tournament -- fixing the rules to do what they want is a good way to keep the game roughly how they want.

They tried to fix their problem by changing the time control from 2min to 5-10min. They already made rule changes to try to slow the game down, but those changes were naive and are ineffective against anyone with 15minutes of basic training.