A few times I find the maximum shutter speed limiting, even with my maximum aperture only f/3.5. Sometimes even ISO 100 film does not help. As another person mentioned, f/3.5 is still pretty shallow DOF with medium format (especially my 6 x 7). In rare cases, I can see how one might need a neutral density filter.
You can even shoot ISO50 if need be too.
I would say that this shutter limitation is not too big a deal once you get used to it. All my cameras now shoot at best 1/700 sec.