Yea, the comparison is completely valid. (I've been making it too)
Similarly, some people are upset with BRD will have to stay still for maximum efficiency while people are upset NIN will have to move into position for maximum efficiency.

We don't know if we'll be doing the same damage as before.
It was never clarified if positional bonuses will be added damage or taken from our current potencies.
There's no reason to make the assumption one way or the other.

Of course the BRD will be balanced around using WM and NIN will be balanced around positionals.
It's not like BRD gets WM and they have some option to surpass everyone while we're tied to being balance.
That reasoning has a clear double standard.