I would put the gradual failure of the FASA system more on the same basic problem a lot of licensed RPGs have: it's an elaborate simulation wargame that happens to use the same setting, rather than a game designed to actually feel like the experience of the show. This is extremely common to the point of absurdity, to the point that even official Doctor Who and My Little Pony RPGs have done it.
I would put the gradual failure of the FASA system more on the same basic problem a lot of licensed RPGs have: it's an elaborate simulation wargame that happens to use the same setting, rather than a game designed to actually feel like the experience of the show. This is extremely common to the point of absurdity, to the point that even official Doctor Who and My Little Pony RPGs have done it.