The way Dawn of War 2 handled it was by reducing the amount of resources each point gave by the game mode. In 1v1 a requisition point was +15 and matured to +30, in 3v3 it was +5 and matured to +10 in 3v3. Power income was similarly divided by the number of players. (Requisition was basically manpower, the reason you got way less in team games was because you didn't have to build as many power generators)
I'm baffled that this system isn't in the game, to be honest. Especially since they go out of their way to ensure that there's always 8/10 strat points, 2 muni and 2 fuel points on almost every map. Capping the map faster due to more players also increases early game income significantly.
Caches are also a less risky investment due to the larger map size. (Although I'd imagine that a player who made a point of hunting cache's would be a huge boon to their team.)
I always kind of considered the entire purpose of 3v3/4v4 to let people live out their fantasies of large tank battles though. 2v2 I don't really notice much of a difference outside of the natural benefits of larger maps.
Agreed it seems like an oversight by relic in maybe about what the fans want. Might make for an interesting poll.
They should of gone with the same here as DoW2. I think the main reason people play 3v3, 4v4 is for two reasons. 1) Friends online at the time who play (That is my main reason for the mode I am playing) 2) is sometimes people don't want the pressure of having it all hinge on them which is fair enough and like the idea of back up coming to bail them out. Nothing wrong with that as this is a game and should be able to be enjoyed by more then pro players.
The increased income effects the pacing of the light vehicle window to operate too greatly screwing over the intended pacing. Light vehicles do not have the time to shine or impact the game. Mediums are only a couple minutes behind so why would you bother.
Also the munition stacks lead to mass shreks/bars/piat/zook hordes.
I think a lot of larger game sized mode players would enjoy the opportunity to enjoy the strategy and pacing of a 1v1 but with friends with them.