[Griefbringer]

Remember that the air power foul-ups work both ways; there are few things more amusing than watching enemy vehicles getting attacked by their own air force. Though having enemy advancing into their own artillery fire zone can be equally amusing (though not all that common occurrence).

As for infantry small arms, in real life long range firefights with them tend not to be particularly decisive if both sides have some cover. Check out for accounts of real life small unit firefights.

Granted, in game terms trying to shift those dug-in infantry units with small arms fire can get boring. However, if you manage to close in, the firefights tend to suddenly turn a lot more deadly. And for long range fire, proper usage of heavy support (tripod-mounted MGs, mortars, artillery etc.) usually gives a definite edge.