Loops vs Y's (non C&TS)

At Tipton on the old SVRy in the original construction a loop was built. Probably for at least a short time this was the end of the line making turning trains at this point a nescessity. Tipton being one of the Summits besides a depot location would have had helper engnines needing to turn here. Based on the 1936 and 1937 timetable, one listing a loop and the later a wye, this is the time frame the loop was taken out of service in favor of a wye. A portion of the loop on the west end still has ties, so a small portion of the loop may have been retained as a storage spur. So my question is why would the rr have pulled up the loop in favor of building a new wye?
The motive power was the same as it had been since 1920 when traffic was much higher, so the curvature of the loop doesn't seem like it would have been a problem though I haven't checked the profile maps to see what the curvature actually was. I have walked the loop several times and it does not appear to be unusually tight. Also the loop was built on a large flat, so marshy ground, snow slides or removal of snow would not appear to be a reason. The tail track of the wye in fact required some cut and fill. Just curious about the advantages one over the other?