Two immediate disadvantages I can see,
First, if each branch has its own design, production and assembly, then you lose the advantages of economies of scale and also acquire higher fixed overheads.
Second, if you have an overall corporate image but each branch can go its own way, then where one branch produces female figure in low status jobs, it will attract criticism from the public in regions where women have high status jobs and that criticism won't be couched in terms of "Playmobil Area X is doing this", but just "Playmobil is doing this". The end result could be buyers in one region boycott buying Playmobil because of the actions of Playmobil branches in another region.