Overall I'm really happy with Aerofly, especially since it provides some aircraft which are simply not present in a simmilar quality in X-Plane or MSFS (A380,787). Nevertheless imo. there are just some things which I greatly miss in Aerofly that I took for granted in other sims.
Something I'd really appreciate would be a generic EFB for performance calculation which could be used for all current and future aircraft which don't have an EFB provided by their manufacturer. I'm simply not a big fan of magically importing the performance values, nor are you able to adjust them for different flap settings, flex takeoff ,packs or runway conditions. The EFB could obviously be used for a lot more in the future (ground services, charts, aircraft weight and balance etc.)
The next big thing would be Simbrief integration. Sure the stock flight planning tool is not that bad, but Simbrief simply is the gold standard. I'm not a big fan of having my flightplan magically appear in the MCDU/FMS, hence why a proper uplink feature would be great.
Another thing which i'd love to see would be custom views (sure you can edit the config for the stock ones, but that is anything but convenient and user friendly.)