So why are these two types of courses not as good for rec play as a course with one tee and one basket for 18 holes from a playability standpoint for an individual? I 100% agree they handle half the volume of players on a loaded rec course and for tournaments.
Lack of variety. Instead of 18 distinctly different holes, you have 18 holes, 9 of which are the same or similar to 9 others, due to the shared nature of part of those holes.