ofc micro should always be the deciding factor. Even in a game with complex strategies like starcraft, the guy with superior micro will almost always win.
Actually if you look at areas around gold league and then compare it to high diamond, the big difference is macro >_>. At least that was how it was a couple of years ago; there was an awesome thread on it.
There will always be more important aspects in playing a game well; microing well in CoH2 has the potential to give you a huge advantage from what I've seen of casts, and is thus very important.
I think the question whether it should be or not is a bad one. Micro just is more important in this case. Sure they could change around the balance I guess, but there is still just as much space for the strategy. You just need to step up to that space with micro.