Apex Legends is a game in which a single team member can drag down the entire performance of the team. In Battle Royale, I meet that player likely once and then maybe again when I already forgot he existed. In Arena, I have to fight alongside that player for 3 rounds straight. If he performs badly and stupidly in one round, he'll do it again for the next rounds. If that one Pathfinder thinks doing the same thing 3 rounds in a row only to die 3 times in a row to literally the same thing, then that's the definition of insanity, and I'm not fighting alongside insane people.
The leaver penalty was a mistake to begin with. You can clearly see that a lot of people aren't willing to play in a team. So why should I stick around these people? The things you do to me, I'll return. Usually with the loss of a player.