Correct if I'm wrong, but a 'zinc die-cast shaving head' is what the Germans call a "Rasierkopf aus Zinkdruckguss" as it says on the German language Dovo website. "Zinkdruckguss" is zamak/pot metal. It ain't brass.
Certainly we are all entitled to our opinions, but I would like to point out a couple of things. Zamak works fine until the plating is broken and the pot metal starts to rot. If razor is dropped on a hard surface the plating can be damaged and corrosion can begin. A more common way for plating damage to occur is the wear on the cap screw from repeated loosening and tightening of the handle. If a softer metal (brass) is used on the screw or handle, the wear on the plated Zamak part will be greatly reduced. This is the approach Dovo uses on their handle, and Muhle uses on their cap screw.
To your point the Dovo is a partly Zamak chrome plated razor. Where I take exception is that it is different than Merkur and many other razors from Asia that cost half as much. By addressing this highest failure area (cap screw)of most any Zamak razor along with better plating the Dovo should out last the above razors.
You have a point here, but then again, the Primo doesn’t have blade alignment issues...
You should shave with it. You likely will change your mind.
If I can find one for a lower price someday, I won't mind buying it. I take your word that it's a great razor.
It's less than 40 Euros on Amazon.nl right now. I don't know if it'll work for you but this shaver really is a good one on my face. Really is!
