Good question. You've obviously read some opinions from constitutional lawyers that align with your view (bias?).What do constitutional lawyers say about the Voice?
In reality, there are differing views from many constitutional lawyers from full support to partial support to somewhat concerned to very concerned.
Unfortunately, your question supports the points I have already made, so I'll just quote then for simplicity:
The impact of any constitutional changes is typically openly debated and well understood and agreed upon prior to the referendum being put to the population. Numerous constitutional lawyers will attest to that.
Historically, a rigorous process has been required to ensure bipartisan support, which has been crucial to the success of previous referendums.
Unfortunately, Albo has refused to be consultive by including a broad range of views in the process, refused to listen to feedback proposing changes that could lead to bi-partisan support, refused to engage is rigorous debate, refused to do the work to provide detail on the function or workings of the Voice and IMO sought to score political points early in the process when he thought he'd get 70% of the vote.
The result of only including like-minded people in the discussion means that the model put forward tended towards the most radical change, rather than a more balanced one.
If the Yes vote fails then this will be the reason that it does.
Furthermore, as Greg Craven (Yes supporter and constituional lawyer) says, and I quote:
The usual condescending response is that the plebs need to be “educated”, as in re-educated, so they agree with us. Of course, what actually is required is a decent civics education program, but that might turn up as many surprises for Mosman as Maroubra. Few superior Australians actually know anything about the Constitution, let alone have read it.