Cyberpunk and the Bloodlines sequel are two vastly different games with vastly different budgets.
CD Projekt Red should be taking no notes from that particular book, as a fully voiced protagonist is far more immersive than one who is not. In a modern game it can be quite jarring when every character is voiced except the protagonist.
Cost is the primary reason why it sometimes is not done. While a silent protagonist is perhaps understandable when there are budget constraints, there is another price to pay - you sacrifice some of the immersiveness of the story you are trying to tell with your game.
That's just, like, your opinion, man.
I find games without voiced protagonists infinitely more immersive. It's why I have thousands upon thousands of hours in the Elder Scrolls games, and about 60 in Fallout 4.
Now, if you just don't like silent protagonists, fair enough; taste is taste after all. But definitely not an objective "this is more immersive than this" type of thing, in my view.
I guarantee you cost wasn't the only consideration with the lack of a voiced protagonist in Bloodlines 2. Mitsoda explained his reasoning in the message you quoted, and cost isn't mentioned as the main factor. Obviously, it played some role, just as I'm sure going with FPP lowered costs for CP2077 for CDPR.