Boeing and Airbus test pilots don't really touch the rudder on a crosswind and land drift on during their extreme crosswind testing regime
I can't speak for flying, or test flying Boeings or Airbus airplanes. That said, I've done a lot of GA crosswind testing, and I have used the rudder a lot! I have done testing (up to Cessna Caravan) where the touchdown was with full rudder deflection (and then a couple of hints of same side brake to heap maintain heading). At those values, I demonstrated compliance with the crosswind handling requirement. I accept that the risk of an engine pod strike affects technique, but to fly a crab only crosswind approach seems like an unstabilized approach to me - at the last minute, a large heading change, and possible drift off the runway.
I know that when I fly a stabilized slip approach, if I can hold the slip, and runway alignment, the landing should be possible in those conditions with little difficulty. I will always train pilots to primarily slip a crosswind approach, right through to touchdown if needed. Particularly in floatplanes, where a sudden crab correction at flare could be dangerous). If those pilots, with basic skills well developed, go on to fly larger airplanes, with different recommended techniques, that's fine - it's skill building, not eroding!