I think the GC Sync issue was made apparent due to the restriction of premades to 4 from 8. Before the change, premades would queue in groups of 8, and would end up generally playing against each other with the forced party freelancer system. This lead to less one sided games due to the fact that the skilled premades were all playing against each other, which make it so that you couldn't synchronise a whole 24 person team of premades like we have now. Therefore, you have PvP discords made up of skilled players and the like taking advantage of the no-freelance setting and all joining the same team.

The skill differential is also exacerbated by the size of the map, since Onsal Hakair is significantly smaller than all of the three previous maps, leading to more access to fighting between teams. This leads to more points by killing. It also doesn't help that you don't need to control a point like in Seal Rock and so they are free to chase and kill anyone they please without repercussion since they don't need to defend anything, so they base camp.