wallers in spar are unskilled idiots incapable of winning any other way imo. just a cheap tactic for people desperate to win, there are plenty of other ways to win in spar that don't involve running or hugging the wall/corner.
either way, most people don't care. spar however you have fun. if hugging a wall for 5 minute spars at a time is your way of having fun then go for it