I kind of agree with this. Is there a theoretical or practical reason behind why the rating system couldn't handle an infinite number of matches between any two players within a season? Even simpler Elo-like rating systems are pretty good at accounting for newbie bashing and eventually award like no points if you keep bashing the same player. And if that player ever wins even once, the punishment for the newbie basher is severe. But if it's about padding win streaks... well, win streaks don't really do anything to get you into playoffs, right? They're just there to look pretty on TUS, so we shouldn't care too much about them in the first place. And if you really wanted to, you could pad them insanely under the current 50 match limit anyway.
At the very least, if there's some reason I'm not thinking of right now, the limit could be removed for pairs of players who are (currently?) both above the starting seasonal rating, maybe? Would that break anything?