for me is ok, a company cannot take 5-10years for develop a module without pay people work on it, for me razbam do in good way and ED valid it, develop minimum feature, sell, fixe bug and implement features missing by rolling upgrade is for me acceptable. if people doens't accept they dont buy. i am happy to get M2000C and harrier, i wait tucano, mirage III, Mig23 and more.
That is so with Windows, you buy version and you must wait all bug fixe and upgrade.