Sounds like technicalities at best. Obviously PS5 doesn't use DirectX Ray Tracing, so it doesn't have the full RDNA 2 integration as AMD describes it.
Why is RGT acting like Series are not custom RDNA2 as well? From what today's news shows, it seems like what's coming in the PC RDNA2 cards predicates a lot of itself off the R&D MS & AMD invested into the Series designs which were developed in lockstep with featuresets relating to DX12 and DX12U. There's a rather interesting timeline to be had in all of this I could strum up if felt like it.
I do think PS5 will have their own equivalents for most of what might fall under MS nomenclature and API range, but there's a a strong chance there are some things that will have no equivalents on Sony's side, either. We've already kind of gotten a hint to at least one of them a few months back when the Italian Sony PS5 engineer put out some info on Twitter. Their follow-up tweet seemed more like something that legally did enough to clarify things but with ambiguous language to leave the degree of what was being validated or invalidated from the earlier statements, up to reader interpretation.
In any case, the new systems are almost here and whatever differences there really are between the systems, it'll be a while before they manifest IMHO. Even so, in the grand scheme of things I don't think it's going to lead to a magnitudes better or worst gaming experience on either platform and its ecosystem, or even games that are too fundamentally different from each other to the point they feel a generation apart.
No, time, budgets and resources will be the
far bigger factors at play on software quality in the 1P camp on both MS and Sony's systems, as well as for 3P games.
EDIT: Also some people need to get off the 'custom' hype train. Just because something's custom does not automatically make it better or even
good. We've seen enough examples of this throughout console history. It just means it's different from the default...if you can determine/ascertain what the default is, mind you.
I never understood the idea of wearing "custom" like a badge of honor. Custom or not, your features either work well or they don't, end of story. My problem with Sony in this regard, is that they've not even explicitly specified what their custom implementations are (for GPU) outside of cache scrubbers, and that was way back in March.
The consoles are literally two weeks away, and it seems like it's MS talking about more specs following AMD's Big Navi reveal, not Sony. Is there a chance Sony does? A chance they actually specify what range of elements are there they've got customized to feature-match what MS are seemingly talking about? Maybe. But we're doing a
lot of speculating and guessing/hopeful wishing there, and I'd like actual official confirmation direct from the source on some of the "secret sauce" features I've seen a lot of people talking about WRT PS5 the past several weeks (again aside from the cache scrubbers and some Geometry Engine changes, which are things we've known since March).