I'll stick this in the box of theories at this point. It is almost as soapbox as most of my roadmap theories and with almost as little tying it together. Reverse theory? Nvidia are actually going to launch sooner than expected and this is negative press on AMD having anything in the pip to soften the market.
AMD have some pretty competent Accountants as well as engineers. Everything about their CPU roadmap is the creation of a design and then rolling that design out to every single layer of tier from Enterprise, HEDT, Mobile, Desktop and Entry Level.
14nm Vega cores have been used in everything from APU to enterprise which to me shows the same thinking at work.
Do we think under the same leadership that it is likely that the GPU segment would have invested all the money required to create a 7nm Vega chip and not role it out across as many verticals as possible?
I was suprised that they have not taken the opportunity to use the 12nm process for Polaris as a final boost to that, but I would be gobsmacked if they did not use the 7nm process for all lines of business given that they have already engineered it.
As for Navi, I am completely behind it being the backbone of a semi custom chip. I very much doubt it is just the PS5 but also in the nextgen Xbox, it gives you reliable revenue to back up development costs. However the idea that it wont also come to enterprise and PC gamers seems nonsensical.