Here's the thing Zac: I'm not a total boss at this or any other video game. I'm a team player. I'm a role player. I fill in gaps. I communicate well. My strengths are almost entirely made up of team oriented play. I never placed top 8 in singles in a Melee event, but I was often picked up as a partner by pros who were missing their normal partners. I know how to plan a strategy and execute it. I'm Cyclops, not Wolverine.
So yeah, I can try to just focus on personal goals and improve by myself, but that doesn't lead to a lot of success for me, nor does it result in a lot of fun for me. For that matter, I'm not a college kid with dozens of hours to play the game, so grinding through unenjoyable content to get to stuff I like just isn't a good value for my time. When I have an hour to squeeze in a game, I don't want to spend it with a bunch of donkeys.
Solo queue is probably fine for some people, but I literally have nothing to gain from playing it anymore. My skill set isn't valuable in low ELO ranked games and I don't have the time to grind my way out. That's why I'd rather play nothing but arranged 5s. I can contribute and have a good time whether I want to tryhard or just have fun with friends.