Give these a read:
Broken stall dynamics - Bugs & Issues / Aircraft Systems - Microsoft Flight Simulator Forums
Lack of Inertia in MSFS? - Bugs & Issues / Aircraft Systems - Microsoft Flight Simulator Forums
And the biggest problem here is that Asobo, under the direction and instruction of Microsoft, does not and will not allow third party aircraft developers to override the default flight model, meaning they will have to stick with this broken, twitchy and comedy flight model if they intend to bring their aircraft into MSFS 2020, which is probably why we don’t have a single aircraft from developers like A2A Simulations yet.