The market will also speak plain but there is also to say that if a title is not localized from the beginning, sales will surely be even lower, especially in a country like ours (I'm really sorry to say) is very ignorant, the problem is definitely the basis, in Italy a few people love to read books accordingly a genre such as crpgs that rely heavily on text reading, are certainly not among the most popular titles.
But the situation is not so bad, personally in my city there are and I know many people who love this kind of games that they have bought and are expecting to buy Divinity Original Sin 2 and I'm also noticing these days which discusses the subject on various forums and Italian sites, many young people who want to get close to this wonderful genre and believe that with a title like Divinity Original Sin 2 there would be no better way to approach it. Unfortunately, however, if securities are getting less and less localized, it will be more and more difficult to engage the younger ones, either because of our weird school system that does not fit the English requirement, either because of lack of possibilities or for laziness, do not know the tongue.
As I see it I also have to say that if a company hopes or wants to sell it as much as possible it has to try to fit in contexts where it usually does not sell a lot, maybe trying to invest a minimum, maybe even looking for alternative solutions (such as such as fan support, especially after the first title has been localizated by fans at cost 0, thus allowing economic return).
Obviously far from me criticizing Larian's choices, or trying to impose my thoughts in an arrogant way, I'm just answering you because you're partially right, but the situation is not so terrible and we were certainly not in 10 to buy the game, so you can only improve.
Unfortunately we all know the problem that has led to the lack of localization in our language, I find it useless and out of place to continue to emphasize it, especially if this page is dedicated to those who hope to make Larian change their mind.
I still apologize for my bad English.
Giacomo