There is only one plus in this, perhaps voice version will be more detailed than short version that you have chosen. But this is also a minus LUL. because phrase can be completely different.
Disagree ... that option is pure minus ... huge pure minus ... :-/
Oh well the silent option is easily implented I think.
Not sure about "easily" ... but certainly cheaper ...
If you only want to create two different voice flavours, you need to double price ... etc. etc.
And concidering how huge this project allready is, i bet they need to keep close eye on budget. :-/