This assertion
I work in IT and used to be a coder.
Appears to conflict with this one
you assume it's a basic change but it may not be.
It is and the fact it was not done is disconcerting.
What about all the other things the dev has delivered?
It is the fact that they created a pretty looking wallet, yet couldn't be arsed to do something as fundamentally simple and required as creating a unique address identifier that worries me.
It's like going to a Ferrari dealer, seeing this beautifully designed car and popping the bonnet, only to find a Fiat 500 engine inside.