I understand issue 2, however issue 1 I think your misguided, or only see what ya know . Trust me.. Mybb in many ways is just like phpbb. Yes some stuff is already built in, but I think most of the built in features are already needed.
Again, it can be edited tremendously, just like phpbb (hence the one I did for my GC Site ) .. I didn't do many tweaks, but understand I did do tweaks to it. I think it's actually somewhat easier then phpbb when ya get down to it.