I'm afraid the same basic rules apply to MSFS as they always did with FSX and P3D. For commercial viability one needs to go with the well-known, traditional subjects. More obscure subjects like the MB usually remain with the freeware devs. We do have one or two surprises coming however.
ok Bazzar, I respect your opinion as a developer. Allow me to express mine. For years now, since the beginning of Flight Simulators (the ones from Microsoft and P3D) I'm a client for many developers. And to be honest, quite tired of buying always the some models, of course with quality improvements. Think I´m the average simmer, not caring to much about systems modelling, just take-off, test the airplane, look at the views and the plane, going from here to there, land, medium or realistic flight model depending on the machine. Love that.
So I bought a lot of planes during all this years. A few civilian twin engines, lots of Spits, P-51s, Cessnas, C-45 Dc-3 you name it. Some of them your make.
Got P3D v5 installed with a lot of stuff from ORBX and I mean a lot. Its a good sim. With a lot of very very good aircraft installed. Great amount of money spent. Since I own MSFS 2020 rarely used.
To conclude...if I want to fly one of the planes I own in P3D, and they are excellent, I will fly them in P3D. They are paid for, twice, from FSX to P3Dv5, will not pay 30-40-50€ again for the same plane even if its better and sure they will. The one in P3d will do the job. You say "For commercial viability one needs to go with the well-known, traditional subjects". Market it is.And you now better...Wonder if a good Lag-7, KI.84 Hayate, Oscar, KI.100, Fw-190 and the Dora, Me-262, Dewoitine D.520 and a lot of others not so well-know, but important in aviation history and the military will not sell. Personally, not going to add another plane that I already own and use in P3Dv5. Regarding MSFS, for my type of flying, sightseeing, stock planes are enough and, btw, bought the Mb339 and WIMF5 reasonable priced excellent models. Now will wait for something really new. Not the ones I see in line.
Best regards, stay safe