My understanding is that drywall tape is to provide structure to the mud as the framing members shift. In my case, I've cut about 17 5" holes in my garage drywall ceiling and saved the plugs. I plan to plug the holes as pictured below (side view).
There's a gap between the existing drywall and the plug. Do I need to tape it? As the house shifts, the plug should shift with the drywall sheet since it's attached to it with the short lath strip.
Since the plug is circular, it seems like I'd need to use something like these (not cheap) instead of regular tape. Aesthetics aren't a big concern since this is a garage.