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Sort of... the input shaft on a stick is a single bearing on the far end of the input shaft, right before where it meets the main shaft, allowing some slight movement of input shaft at the tip where the pilot bearing is. The pilot bearing alone is what keeps the clutch and shaft in perfect...
I would say you're correct about the simpler alignment aspect. Many similar type pieces of equipment are built this way. It definitely simplifies assembly as well as repairs. You would be hard pressed to get any engine and driven unit bolted solidly together if both used bearings on both ends...
You're right that parts are sometimes hard to come by but careful research will turn up that there are still a few places where you can get the parts you listed at reasonable prices. For example, I recently needed a #14 timing button... couple places wanted over $100 each, but further digging...