well, I don't know how modding can work there, but if there is basic enough mod support, I believe that ksp2 is a better base than ksp 1 was for them (newer engine, better render pipeline, multithreaded, using GPU and not only CPU...). If mods can modify in depth the game, then it could (like mods do for skyrim and minecraft) correct the bugs in a "rushed release" I imagine?
Or perhaps T2 said something alike "pour everything in the game, private division will only do bug correction" meaning they would have 100% the incentive to just release a completely broken thing so PD will have to maintain it and render it functional?
