AMD isn't done, but neither is Nvidia. Navi is their response to Turing. It doesn't have RTRT yet, but that doesn't mean it isn't their response.
I generally try to avoid this type of wording, especially since it challenges the definition of the word "response". Navi was meant to compete with Pascal, but was delayed 1.5 years so it ends up competing with Turing instead, and even that is a stretch, because Pascal was after all a backup plan due to delays to Volta.
Let's take another one to make it even worse; Ice Lake(Sunny Cove) was intended to launch a few months after Zen 1, and was designed long before Intel knew any details of Zen at all. Now, the first Ice Lakes actually launched after Zen 2, and the rest will arrive around Zen 3, so can we then call Ice Lake/Sunny Cove a response to Zen(1/2/3)?
You might be right about this. My only point is that Navi with RTRT exists. The only downside that I see to this strategy is that consoles won't be out until holidays of 2020. That would mean, no AMD RTRT for pc until 2021 at the earliest. That gives Nvidia basically almost 2+ years to establish a dominant standard that AMD would have to play catch up to. We are seeing how hard that is with Cuda.
If any Navi based GPUs will have some kind of accelerated RTRT, it will be something AMD threw in there "last minute", and will be nowhere close to the power of Nvidia's solution.
But remember that while RTRT will eventually become widespread, the process will be slow, and it will primarily be a
nice to have feature until then. In the second half of 2020, we expect Nvidia to launch their next generation, and if AMD can't match this in efficiency, it wouldn't matter if they have some primitive RTRT or not. Then AMD will continue to be stuck only really competing in the low-end, having <10% of the mid-range market share and no presence in the high-end.