Low prio is a joke. It keeps people uninterested in coming back to the game because it forces them to somehow win with heros they don't want to play. No one is going to want to commit to play multiple 1hour matches just for a chance to play regular dota with their time off. I literally left the game for a year because of this dumb system, I can only imagine what other people do when they receive that 5 win requirement. Why struggle in low prio when I can literally play another game that doesn't punish me as harshly for having a life outside of dota 2. The system doesnt even work if you are good you just stomp over everyone els and get back in. That means that the newer players that get reported for being bad and get sent there are literally in hell. just give people cooldowns and youll see a higher player base.
Source: https://www.reddit.com/r/DotA2/comments/qdxus1/low_prio_should_be_changed/