I was looking at this add on for x-plane https://www.simcoders.com/reality-expansion-pack/reality-expansion-packrealistic-xplane-engine/ it looks to be something I would be very interested in for MSFS series too. I know we have some very realistic aircraft/engine simulation already such as A2A, Black Square, COWS, but it would be really neat if someone developed something like the simcoders engine but covered all "generic" aircraft or those aircraft that do not have these "extras". Like have a piston engine model, small turbine (i.e. corporate jet), turboprop. Or if that is not possible maybe something like simcoders has; a module for several generic aircraft (aka Black Square).

Anyway I just think it would be great to have more aircraft in MSFS like this?

Yeah it would be nice to have for a Carenado etc.  XP is so much more open to modifications though.  Especially with 2024 flight model files are sometimes locked behind drm.  

I'm not sure how feasible this would be 2024 or even 2020.