Your points are well taken. I guess I was just hoping for a little better fidelity given Richard Perry's other records from that era such as Ringo, and Nilsson Schmilsson, which sounded great.
Those albums were on other labels so maybe it is a Columbia Records artifact.
There are a number of factors in play here. Including the recording studio where the album was made. The recording engineer that worked on the album.
The mastering engineer on the project. The record label and artist's desires on the level, eq and mix of the finished product.
Any of these aspects of the recording process could have changed the mix, mastering and sound of the album as released.