So how does this matchmaking overhaul make the game better? “The improved matchmaker assembles teams choosing from a set of server-based algorithms — templates — so that both camps always have the same number of vehicles at the top/middle/bottom of the list. It also limits the number of SPGs per side to 3 at the most and significantly reduces the instances of map duplications.”
In short, fewer unfair matches and more battles in which you’ll have an honest shot at victory. The update also changed SPGs to become long-range artillery support for teams and revised the light tank lines to spread them all of the way to Tier X.