My only concern in buying stuff for msfs2020 now is that it may well be a part of msfs2024 default scenery/aircraft. Has happened a few times already in World Updates where 3PDs have sold stuff directly to us only to then sell it to msfs to include it in a WU (looking at you Orbx). And that just sucks (for me).
It's not knowing what's going to be in by default in msfs2024 which is the problem for me so I'm going to look very carefully at what I buy for msfs2020.