I don't need Link to have voiced lines specifically, because as others have said he is not really mute, I like that we can choose Link's answers and he is very expressive when he's interacting with some NPC's. The real problem are the cutscenes, every memory in BotW when one of the champions or Zelda talk to Link he does nothing and just stands there like a doll (for example when Zelda is angry and yells at him or when Revali challenges him), and I really don't know why they chose to go with this, because in past games even if Link didn't talk he was very expressive and you could know what he was thinking or feeling.
Just check this cutscene in Skyward Sword:
You can easily tell he's desperate to stop Zelda and then really sad.
So don't give him a voice but please let him intereact and be expressive with other characters like in Wind Waker, Skyward Sword and other past games.
The voice acting in BOTW sucked. Link being mute was a blessing, and that's how he should stay. It's just a part of his character.
Like someone else already said, I'm sorry your English dub sucked guys but the Latin American Spanish dub was great and I want future games to have one too and I bet people form other countries would agree to keep their own dubs, just get better voice actors next time.