trip3980: You've only been here in the forum going all the way back to 30 November 2015, which is a lifetime when you're waiting for a Pi Zero to become available to buy
. Your approach is totally appropriate for a capital-backed venture that can afford to burn Other People's Money with nothing to show for it should something go wrong, and as an engineer, I can guarantee you that _everything_, every little picayune thing, _can_ not only go wrong, sooner or later, it _will_.
The Foundation is a charity, a non-profit organization whose sole goal is to improve educational computing, that's it. If your needs happen to coincide with their educational mission, so much the better, but they're under no obligation to cater to your whims. Its goal is not to satisfy the general market with doodads that some people say they want, but when it comes to reality, they can't understand just how much work it takes to do the really thorny engineering needed to get even something seemingly as simple as a Pi Zero produced. It has to be designed, prototyped, debugged (it wasn't just a matter of tossing out components, believe me), reimplemented, debugged again, fixed some more, tested, made less buggy some more, put into pre-production, RF compliance tested (not at all a small effort or cost when it comes to active RF transceivers - especially multiple ones), have more bugs stomped on, final-tested, the assembly line designed/debugged/documented for both manufacturing and testing, go into limited series production, assembly and testing tweaked, manufactured in initial quantity limited by funds in the bank or donated by principals (board members), and distributed.
None of these steps comes without risk, and some have been done on a volunteer basis by engineers (I don't know if that's still partly or completely true, but I wouldn't doubt it for a second in getting the Zero to $5.00). If anything went wrong, you instantly have thousands of paperweights (albeit, in the case of the Zero, not even much good for that!). No more money, no more charity, no more educational benefit - poof. All so you could have your "sure thing" WiFi and Bluetooth. Sorry, but I prefer a world where they Foundation continues in a healthy existence.
The Foundation has been wringing every last iota out of the BCM-2835/6 and related components, to the point of wringing most of the components out, too, in the case of the Zero! They hitched their wagon to a convenient device already fully amortized and then some, and created a wholly-unexpected new market for it that's larger than the commercial product for which it was originally designed, AIUI. They have to bide their time until another device comes along that has any more desirable features at an equivalent cost, and then they have to be able to buy it, in quantity.
As others have pointed out more than sufficiently, you're welcome to pay to have at least three thousand of what you want built with whatever you want ... as long as you're willing to pay all of those development costs mentioned above. Ah, I see, that's not your area of expertise after all ... that's been pretty much the case for marketing experts who have come here to share their certain knowledge of how the Pii really ought to be developed ... without any of the hard engineering work necessary to do so.