Yeah, they originally had it all open and found out that it was a mess. Having very distinct and static characters is a neat idea but the problem is that there is usually one set of them that everyone wants to play. I've started just playing tanks to get short queues, but it gets boring quick since there are so few of them and not much difference in play style.

The other issue is that if you play casually and get a terrible healer, then you will almost certainly lose. Being a fantastic player only gets you so far.

Other people mentioned Valorant, and it appears it has a very different style with exchangeable weapons that apply to all classes, but just different abilities and more strategic games. It seems like a really good player can make a bigger difference and play solo. I'm going to look into that now.