True.
Though that would seem to make the argument for needing slower 1/12's a bit weaker.

In the UK the two classes run at different events 99% of the time, so tracks can be 'tuned' to suit.
Club races in the UK are far more of a mixture.
My indoor club has GT12, LMP12 (1/12) and TC's
Essentially, all those classes are 13.5 blinky, but you can run what you like if you really want, you just can't get championship points.