Wanted to follow up on this for anyone else who experiences this issue. I finally got it resolved, thanks to a suggestion from IniBuilds.
My LAX scenery was not loading; no matter if I spawned there or had KLAX as an arrival, I was getting a very “basic” airport. The solve? I deleted my scenery cache folder and voila, all fixed.
The scenery cache folder is found in the main directory of your MSFS folder.