Because it doesn’t seem to matter currently if you play ranked games or casual games, the general experience tends to be the same. But one has numbers and things to go with it. You still get people playing to win in casual games and you get people dicking around having fun in ranked games, and the ranks don’t necessarily indicate how they play as a team and a whole bunch of other things that make it less than ideal.
Chivalry 2 might be the only PVP game I played where I often still have fun when losing.
Team Fortress 2 and Fall Guys have this quality as well. I wish more games would embrace the goofiness. It’s harder to take a match so seriously as to become toxic when the game isn’t even taking itself seriously.