If you think about it, ROAR and every other RC governing body really screwed the pooch when they dreamt up the rules, or lack thereof, governing the "stock" brushless motor. The rules for brushed motors were immense and draconian by comparison, with rules governing each part of its construction down to soldering techniques. We had none of these for the first decade of brushless racing, and as a result we had The Wild West where everything that could be used to increase power and RPM was. Anyone remember BOOST? I thought boost was the best thing in RC for a long time, but it was also a direct result of reading between the lines in the rulebook. It wasn't banned, so it was legal.
I guess at the end of the day, what SHOULD have been done was take the ROAR rule book for brushed motors and substituted in wording for brushless including having a required gauge and minimum length of wire, with a specified wrapping method around the stator, a spec thou-shalt-not-be-more-nor-less stack height, a fixed timing value, and all the rest. But they didn't. The interesting thing about letting the genie out of the bottle is that they are really hard to get back in again, so here we are.
The good news is that we can expect these leaps in brushless motor tech to slow down, rules are being implemented and will continue to be so, but it will be very, very hard to implement a rule that retroactively makes a large amount of currently legal motors illegal, such as requiring locked timing and a spec wind beyond requiring the motor to be a Y-wind motor.