I think the point is that with licensed themes, Geobra are attempting to make the figures look as close as possible to the on-screen versions children will be familiar with. This might even be a condition of the licence. The fact they sometimes fall short of that goal (especially with Lucky in the Spirit series, IMO) will not worry Geobra unless it reflects in sales.
They certainly don't care about the customisation possibilities or interchangeability of parts (in licensed sets or anywhere, hence System Why?).
Super 4 sets, for example, have brought 20 new hair parts to the PM world (12 interchangeable with others on 'standard' heads, 3 interchangeable only with one another and 5 molded into the head in the same way as children's hair styles, so not interchangeable- and probably the whole heads from these 5 are not widely interchangeable, I just learned!). But so far, none of these hairstyles has been used outside the Super 4 theme and that may well be intentional.
It's too early yet to say whether HTTYD hairstyles (7 new styles so far) will be seen outside that theme. But Ghostbusters brought no new styles, so maybe not every licence (or licensor) demands new parts.
