"Can I switch with you I only play ___"
If you play a popular carry role and only main that role, you should really know how to play every other role or at least be able to get by.
You will DEFINITELY get autofilled at some point or get put as your secondary, and nobody has to switch with you if they don't want to. If you're playing a role that will end up getting you autofilled eventually, especially in ranked, then you should AT LEAST have 1 champ for each role that you can get by with.
Like I'm sorry you didn't get your role but it ticks me off to no end especially in ranked when adc or mid or top mains get autofilled or put in their secondary and say "I only play ___ can you switch"
Same goes for people who one trick 1 champion. If they get banned at least have 1 other champion you can get by with. You won't get them 100% of the time.
In norms it's not a huge deal, but in ranked...come on...