I wanted to comment about two very noticeable improvements I noticed with the Simulator Update 4 (1.16.2).
First, there is a significant speed increase when navigating in the main menus. The transition is a lot faster and now very snappy.
Second, Asobo / Microsoft seem to have fixed the scenario where any additional plane would not load the first time MSFS is started. Although visible in the profile, they were not available in the selector. Closing MSFS and starting it again immediately would always fix the issue. This would happen with all the planes I bought from the Store - only those.
Again, your results may vary. But in my case, this was obvious.