Why should manufacturers produce this specialist tool?
Leica already owns the dedicated b/w shooter of means; I don't for a moment imagine there's a crowd, several million deep, of anxious b/w shooters anywhere just praying for a plethora of dedicated b/w cameras. For pretty much everyone, conventional conversion gives all that is sanely required. Manufacturing is about making money. Period.
If you can't live without the true b/white experience, just start buying film again. If you never did, then you have no idea of what the b/w experience really is, and the argument becomes absurd, as does all this crap about DR etc. et bloody cetera. Look at much of good back/white photography and you will discover that it has always led the way in creativity, which means that it constantly breaks the rules because it's only by doing so that something different happens. Because of that, you'll discover that many of the b/w greats never deployed a perfect range of tones from max black to whitest white: they played around with deep shadow, blown highlights and so on.
If you want to invoke St Ansel here, do so at your peril: a superlative craftsman, I would hesitate to think of him as ever being visually exciting.
Rob C