Full premades vs randoms.

Agreed. 100%. But the developer envisions this as a team-based game. If you can't or won't find a group of like-minded players to queue with, then you have to accept all the handicaps that come with solo queueing. It's a bitter truth, but it's the game we play in and there is no changing it. There can only be adapting to it or resisting it and letting it frustrate the hell out of you.

The community been asking for a solo q only option for years now. I think the biggest challenge is the q time for the devs but I honestly wouldn't mind waiting longer for a solo q lobby because it's more fair. 

Not everyone has friends that are great at the game or friends that can get on at the same time together. 3 stacking mainly benefits the ppl like the pro players since they can play the game all day every day. Also pro players want more difficult lobbies too, let them 3 stacking to going against other 3 stacks. 

The problem i see with solos only is that it removes the need to respawn a teammate and that in turn removes a dynamic from the game itself. I can see why they would not invest the time for such a game mode. But honestly if the code were written right, it would be a simple config value being changed for team size and that would be that. Then they could see and show us how unpopular it really is.

Use the Play with Squad feature.

If you're not actively using the PwS feature or using your mic then you have dismissed two mechanics that will help you find a stack. 

Personally, I do everything. I like getting along with people and chilling. It works, try it.