I would have no problem with a definition of "feta" that focused on things like the ingredients, process or qualities of the resulting cheese. Those are the sorts of things that a law intended to protect consumers would focus on. Instead, the EU defines "feta" by region (with some ingredient and process requirements as well), which is simply an attempt to benefit producers. I just want a bit of honesty about what these sorts of laws are intended to achieve.
In my opinion, the "feta" geographical indication is a particularly absurd case, since "feta" is just the modern Greek name for a type of cheese that's been produced throughout the Balkans and in Turkey since time immemorial. Greek cheese-makers are lucky that their name for the cheese became international (as opposed, say, to the Serbo-Croat name for the cheese), and now they're cashing in on it.