I like your sentiment, but i dont think it works in practice. There are so many unhinged ppl playing that we need to have a way out. I do leave matches, but only when i play with my friend and we are SO done, or when i have an actual idiot or psychopath as my teammate. I think a good way to discourage leaving ranked games is to make the penalties much, much more harsh (like 10 min for first leave). I think the penalties should be removed if you are playing casual, bc casual is for fun, and a racist, screaming 9 yo is not fun.