Saint Helena and ROME were not built in a day.
If you expect EVERYTHING to be in MSFS when you purchased it. and Asobo were to attempt to do that, you would still be waiting for MSFS release in 2030 !!
If an airport, island, plane , building are missing, and you are that passionate that they should be there, then maybe research it, and learn how to make it yourself, and then share your work with the community.
This is how so much of the Freeware (and payware) addons got created - by community members, getting down to it, and getting it done.
This is a major part of what MSFS is, a live, growing simulator, that anyone, with the drive & determination can contribute to.