Lets say you are queuing solo and you get into a warzone with 7 other people that all had solo queued.
Now after that warzone you invite three of your teammates from that PuG team into a group and group queue them. you have now just queued a four man premade.
But what is different about those players now that they are queued together into a warzone rather than being pugged together? Their gear is the same, their skill is no different. Nothing is different
they are just four players in a eight man team just like in the PuG wz they where also four players in a eight man team.
Grouping doesn't make anyone better or make winning require any less skill.
Also if your not convinced I have a very simple solution to premades