[Updated 2] Just to inform fellow players about "The Mighty Jingles"...

Ectar:   It's not the only reason, but it is explained well.  With larger maps and the game as it is now, mediums and lights would be fighting each other mid map, then they need to push against heavies behind them and TD's who are waiting/defending. When playing the T28 Prototype there is multiple matches where I find I miss the main action then am forced into defending against the enemy team pushing into my base. The PzIIJ has the same issue (although I hardly play it).  You're basically too slow to contribute to the main fights. Without adequate cover to move up with, the slow heavies and TD's would be wiped out when spotted by light who would be more active with the larger map.   In the video Slava mentioned that having 2 spawns per team could resolve that (with slower tanks starting further forward for example) however that opens up a different discussion and goes off topic from the main subject which is the maps.