Medium format regarding 120/220 is a different story since you could be spending a minute or two to load 8-15 shots, plus those rolls are more prone to letting in light during the reload process. Also, when you're taking a film bag on a long trip and don't want it to be bulky.
For what it’s worth, this is what the entire 70mm “ecosystem” is built around.
Most of the major medium format SLR systems had the ability to take a 70mm back. 70mm film typically was daylight-loaded in metal cassettes that look like overgrown 35mm cassettes. For conventional thicknesss film, a standard load is 15ft, which translates to about 70 6x6 exposures. You can actually squeeze in about 20ft of aerial surveillance films(which are also common in 70mm) but I’ve never tried to load that much. My developing reels only hold 13 ft so that’s usually the most I will load. I normally target around 6 ft, or ~30 frames.
Kodak offered a few emulsions pre-loaded in factory cassettes. A bunch of the cassettes I have are stickered for Tri-X or Vericolor III. I’d dare say most 70mm was sold on 100ft rolls. Hasselblad made a somewhat uncommon back that was designed to be dark loaded without the canisters and could take 100 frames, and there’s a rare one that could take an entire 100ft roll.
The whole system around 70mm is sort of its own beast as at any given time with a back in use you should have two cartridges, a supply and a take up. Since the cartridges are light tight(they have a felt trap just like 35mm) only a short length of film is out at any given time. On a Hasselblad A70, it’s about 4” of film-one full frame and two halves. That means that if you inadvertently open it or pull the dark slide, you’ve only killed a few frames. Not long ago I bought a back that I knew had film in it thanks to the seller showing it open. Once I’d IDes the film(Tri-X) I shot it. If you want to develop before you’ve shot the entire roll, just take a few unimportant frames to make sure the ones you care about are safely in the take up canister then open the back and cut the film. I just ended up with 400ft of Plus-X Aero, and have a 15ft roll of it loaded up. I’m planning on shooting it tomorrow and will cut it mid roll at least three times, possibly more, to figure out EI and development for using it.
BTW, I have some 70mm on the way from the OP of this thread.