I, and other users of Hasselblad film cameras, in particular the 500 CM series, rarely find situations that outstrip the abilities of our photographic ambitions in 6cm x 6cm l, 6cm x4.5cm and 4 CM x 4cm medium format photography and that is most often the number one reason why those of us that have fully embraced that still vital system and use them.
If we do no have a certain lens, back or other accessories, just as other slr shooters experience, that's just normal, but having built our kit over the years, when we want/need a particular addition for our 'works' we have excellent odds that we can find what we require was made, is available and still bares the quality of photographic excellences that the equipment is framed for and realitive slow shutter speeds, apautures, and work form, in most cases, do no mean we are burdened but rather, willing to work with to make the best photographs each of us are capable of.
I've worked in the past, on some of the alternative systems others here prefer, as a freelance assistant and photographer and having owned a new two body 500cm system and a nice set of lenses, mostly cfi models, and other goodies, recognized the difficulties the other brands had, in comparison to those more expensive Swedish kit.
Hasselblad analog bodies, lens, viewfinders, backs and other kit works great and that's the only reason (neverminding collectors and fashionistas) to own them!
IMO.