Are most Smurfs just one tricks who hit their ceiling?

I truly don’t understand smurfing outside of just wanting to play against people you know you can beat. It seems like you most likely one trick your way to your ceiling and then get pissy that it doesn’t work anymore and then you Smurf in order to extend your playtime where one trick works

Edit for response: Lots of comments have made a lot of sense. The main point coming up is that people don’t want to throw a game for their fellow teammates and that sounds more than reasonable. I think the thing I didn’t understand the most is smurfs who are solo queue on their mains. That was my main point I was curious about.

If you solo queue on your main as a Smurf - whats your reasoning then?