I converted a Chevy pickup from 2pc (original equipment) to 1pc (also OEM from another pickup) driveshaft. The 2pc on it was problematic- had some vibes, needed a new carrier bearing, etc. Why, when the exact same chassis/engine/trans/axle combo was available with a 1pc, did they ever dick around with a 2pc???
That was a VERY worthwhile mod from the vibration/service requirements/cost of joints and bearings standpoint. In theory it should help fe too but in such a small amount you will never be able to detect it.