They don't release specs for the fourth generation when making the first , shit they don't know themselves what the end product is, they hope it hit's projections and your making assumptions based on rubbish clearly ,when x370 came out they may have had an idea what the next year's chip might do but to expect four years of foreknowledge down to specs and features is dumb.
Surely intel would have a much easier time competing in a few years if they know exactly what AMD will make.
I don't get your butt hurt stance if x570 could not update ,that would be a scandal, x370/470 simply don't support all features already, PB2! Pciex4 so can't possibly expect parity going forward.
As I also said even if AMD released a supportive ageesa bios ,it WILL be a shitshow as to which boards ever get updated because the manufacturer gets no money and looses for sure a board sale.