Why Don't We Say Shehecheyanu on Sefiras ha'Omer According to the Rambam, Specifically? (Hilchos Berachos 11:9)

This afternoon (5/3/22), in our Rambam Bekius chavurah, we tackled the question we raised a few days ago by learning through a piece in Hararei Kedem and weighing in with our own thoughts. The piece begins by examining the "famous Baal ha'Maor" on this question, then shows how his answers are inadequate according to the Rambam, and then proceeds to offer a sevara which explains the Rambam. I'm curious to know what _you_ think of that sevara.