Sure. For the particular instance I’m in now, I have a series of different rooms that repeats down the length of several buildings. Each building starts at a different point in the series. If I could clip them I could let the series run past the end of the building and clip it so that it only showed the rooms that were inside the building, while keeping the series as a single block.
It would also be useful when drawing 2D elevations. For instance, if I had a block for a window and in a couple instances a light fixture cuts in front part of it. Right now, I have to explode the window block, and trim all the lines that go behind the fixture, so if I make any changes to the window, I have to update all of the exploded blocks manually.
Or if I am using a linked block (to be honest I still don’t really under when to use linked blocks vs. worksessions), I could bring in a floor plan to do a furniture layout of one room and clip it down so that I’m only seeing the part of the plan I’m working on. This makes the file much cleaner and easier to navigate.
I’m sure there are other instances where it would be useful as well, those are just 3 that come to mind off the top of my head.