It could always be interresting, especially for replay value, lore and races immersion/depth and to fit their "many different.possibilities to solve situations" things.
Switch companions is.not interresting, but also not necessary... Anyway as.I said it could leads to interresting feature, events and situations but that's not something I especially expect or I will alk about during EA.
I personally never thought about it before hearing the question but I think it's an interresting subject.
If you can't talk to certain people because of a language barrier, that means that you can't accept any quests from those people. That means game balance will need to take into account the amount of XP available for any combination of languages known. That seems like an impossible task.
