I enjoy team games as well. 2v2 is my favorite game mode anything bigger than this I play only for fun and don't expect to be balanced to the same level as 1v1 is. Quite often 3v3 is a unit spam and nothing more, it's hard to get all players with the same skill and you are carried or dragged by your teammates quite a lot as a result. It's easier to gain resources as well so it's normal to see very powerful abilities more than once in the game. It's possible to have opponents gang up on you 3v1. How will you consider balance issues when that happens? To what extend it was a balance issue? Or maybe it was your team not playing together?
You have made this argument earlier in this post and it was addressed there. I will address it here once more:
1) 2v2+ games cannot become a dumping ground for OP abilities that rarely get used in 1v1
2) Team games deserve to be balanced to a degree as they are part of the purchased game
3) Large changes that are clearly bad for balance in 2v2+ but do not change 1v1 should still be changed.
4) Balance on a unit by unit basis is done in 1v1, but the meshing of all units together requires careful balance to allow team games to work
Resource points are approximately as numerous in 1v1 maps as they are in team games with minor exceptions. The difference is that larger number of players mean the game usually goes on longer, because a clear winner takes longer to find.
If you are seeing a lot of unit spam in 3v3 and 4v4 games you need to really look for higher level play. I can promise you at the higher levels of play unit spam is not the plan. I see as diverse armies in larger games as in small. I rarely have more than 2 of the same unit in 3v3+ games even when I have 10 or more units.