Yes I totally agree with you. Choosing the English version is indeed my choice, and yours. But some players do need translated versions because they're not fluent in English. If translations are available, I will suggest my players to get them if they prefer. If something doesn't seem clear, we'll look in the English version of rules, and if it's still unclear, as DM I'll make a balanced choice (I don't play against my players, but as a representative of monsters and NPCs, I try to make choices that are fair to them too).
If WotC does not do translations, we can start a community driven effort, and translate the free PDFs to various langages and keep the English core rulebooks at hand.