I can see where you're coming from, but I find language barriers to potentially be very fun. So much so that I've basically taken "Common" away from most creatures by default. It's a trade language that PCs, merchants, travelers, nobles and such probably speak. But your average orc or elf doesn't. Even your average human commoner only speaks it if "Common" happens to be derived from their native tongue. Otherwise they speak a different native human tongue. So if you are dealing with a tribe of goblins, maybe the leader and/or his priest speaks Common, and the rest of them just speak Goblin. You visit a human village off the beaten path, and the only people speaking Common are likely to be the innkeeper and staff, and perhaps someone who used to live elsewhere.
Since languages can be learned during downtime, it gives players an actual incentive to do so, and let's them feel that their choice of language means more than just allowing them to communicate "in code" with some party members by virtue of both speaking Aquan.