Changing Spawn positions to base building is useless and pointless, and it destroys the flow of a match in CoH 2.
Want an example to make myself more clear? Crossing in the woods in 1v1s or La(o)ngreskaya. Just imagine being USF and going for an aggressive left side early game plan. Oh no wait you can't anymore because your Base building is now pinned to one side of the map allowing your opponent to dictate the flow of the game, specially if he is Ostheer. Rip your game plans rip your aggressive opening, giving Ostheer (hell even OKW) the possibility to play passively the first minutes gives them a huge theoretical advantage.
PS: Nobody cares if some diehard CoH 1 players will be happy about the changes, there are many more CoH 2 players that would rather not have this totally useless old mechanic to be reimplemented.
(both noobs like me and top players like VonIvan, just to mention a name)