I'm an artist photographer using mainly medium format all of the ~50 years of my professional life. I never owned a Hasselblad, I relied on Mamiyas mainly, but I have nearly tried them all. Yes, most of my collegues had a Hasselblad once they could afford it, and yes I have tried Hasselblads thanks to them. They are not my cup of tea and they claim quite a budget.
Well, Hasselblad was one of the most popular, one of the longest manufactured, and arguably among the very best medium format systems ever produced. With an outsized reputation. (Wrangling your way onto Moon missions and into films like Blow Up kinda helped, back in the day.) So it's only natural that they'd get discussed a lot here, probably all out of proportion to their place in the medium format ecosystem. And this, properly, is the forum where those discussions belong.
But I'm with you, it's great to hear about other systems as well. I personally used to use a Mamiya TLR system and loved it well enough, although I did trade it in for part exchange on a Hasselblad system. (Please don't hit me!) I still use an RZ67, and occasionally a Mamiya Universal. And when my funds are built back up, I'd love to have a Mamiya 645 of some kind. Plus, I do have an elderly and battered--but very nicely working--Rolleiflex. And I even have an ancient Balda 6x6 folder I occasionally break out for fun. But of all those systems, I do tend to use the Hasselblad far more, and so I naturally talk about it more myself.
But as others suggested, dive right in and post a Mamiya--or Pentax 6x7, or Fuji Rangefinder, or whatever--thread. I'm sure you'll find plenty of people willing to answer questions/chat about them! I certainly would love to see them.
(Somewhat related aside: back in the early 00's, I briefly worked for a firm shooting weddings, until I discovered that was *not* my personal cup of tea. I bought
the book everyone recommended at the time, and one piece of advice offered in the section on gear was that if you were shooting medium format, get a Hasselblad. If I recall properly, there were a few practical reasons for that. But the chief and overriding one was that while people in general had basically no knowledge or understanding at all about cameras, *everyone* knew that Hasselblad was a "great camera," and so you would be *perceived* as being highly skilled and professional since you were using the "very best" gear available. It was part of building your brand.