A few hours back, Square-Enix revealed that Dragon Quest XI on the Switch would be called Dragon Quest XI: Echoes of an Elusive Age S. The 'S' in the title was said to stand for “Switch,” “Special,” “Shaberu” (Speaking), and “Seiyuu” (Voice Actor). While we've reported on that already, there were some follow-up comments from Dragon Quest XI producer Hokuto Okamoto about the 'Shaberu' aspect mentioned.
“Even though shaberu (speaking) will be taking priority… I think there are some players who would prefer Dragon Quest without voices, and we’re keeping that in mind. Horii will be able to say more about that at some point…”
Sounds like there might be something in Dragon Quest XI on Switch that will change how voice acting works, or eliminates it altogether. Either way, there's definitely more to the story than we know right now.