I recently obtained a heirloom, so I've been wanting to play Apex a lot more now and I've been solo queuing a lot more then I usually would. The amount of times that I've lost game due to someone in the squad just leaving the game, and 9 out of 10 times they're not even full killed. They just leave the game while they're knocked, and don't even give anyone in the squad a chance to revive.
I think there needs to be a more harsh punishment for leaving the game before your respawn times out. After your respawn times out that's completely fine to leave because then its your teams fault for not grabbing your banner. I also think there should be a punishment for not grabbing a teammate's banner. I love Apex but I hate it when I'm getting 3rd partied and one of my teammates goes down and they just leave. That alone immediately puts us at a disadvantage because we now have to 2v3 every other squad.
Source: https://www.reddit.com/r/apexlegends/comments/hq2nsd/apex_needs_a_more_strict_abandon_penalty_for/