FBW is limited due that the A320NX base model is a propriety of Asobo; then they have to work "in sycro" with Asobo in this terms, to avoid the possibiliy to violate somethings and f**k up with all the works they do, that's the real bottleneck actually, not the difference between a business man or a volunteers.
If fact in few time they grow up and start their A380 project.
Mr. Kok don't get angry, I love Aerosoft phylosopy and products, and I know also develop products on MSFS2020 have less "technological constraints" that work on old P3D/PSX platform, but these "volunteers" of FBW have done in a very few time a "thing" where Aerosoft instead have worked for a very long time; the AOC Printer.
"Réddite quae sunt Caésaris Caésari" - give to Caesar what it is to Caesar