I have yet to encounter a boarding barn that soaks pellets for any horse except the special needs critters.
My old horse with dental issues gets his pellets soaked. My other two do not get their food soaked. My one horse will simply not eat soaked food, she is sure I am trying to poison her if I make her food wet.
Nothing wrong with soaking if you like to or your horse needs their feed soaked, there is also nothing wrong with not soaking for the average horse.