That's not an x86 bottleneck as Microsoft is bringing the tech to PC[1], and best part, it even works on Gen 3 SSDs so you don't have to burn $ on top of the line Gen 4 drives.
Look at slide 5 — they are still using system memory instead of reading directly to gpu.
Although ms rep did say that direct streaming is being worked on[1]. Also we still don't know details on nvidia's proprietary rxt-io. But I wouldn't call that solved.
[1] — https://imgur.com/a/fHnLLQo
It's the same story every generation. There may be some things the consoles are better at right now but give it 2 years and we'll be complaining how the consoles are holding things back again.