I Think I Figured out How to Prevent LP Loss
If I block someone after a game, it's for a good reason, right? Maybe they trolled, maybe they were offensive. Maybe they were just having a bad day. Who knows? The likelihood of them appearing in another of my games is small, but there's still a chance. So, if they do appear in any of my queues again, I'll just eat the time penalty and the small LP loss. I've better things to do than willingly subject myself to another dose of prolonged torture.