If you can't keep the aircraft pointing straight down the runway with crossed controls, the crosswind is out of limits.
If you can't keep the aircraft pointing straight down the runway when the crosswind is within max demonstrated, it's the pilot who's out of limits.
If the aircraft had eyes it would be rolling them
.
Crab or crossed controls down the approach is personal preference. It's short final that matters. I think this 'kicking it straight in the flare' business is a form of madness.
This clip shows nicely how it should be done in most light aircraft.
https://www.youtube.com/watch?v=ZXz3ESt4Jy8