Its like how you look at SCI FI movies and see how everything is based off iso crystals or some sort.
I am thinking that will be the RAM / OS / Storage all in 1 part, and the CPU/GPU/Motherboard will be its own.
That changes nothing. NAND tech itself is limited to about 50-100us, and that's under random reads. It's literally 1000x the difference. Writes are worse because you need write-delete-write cycle, which is so slow that without DRAM buffer it would be absolutely unusable beyond 1-bit SLC SSDs. Under random writes, bufferless 2-bit NAND is in the slow HDD range for speed. Even DRAM-less SSDs use tricks such as using system DRAM or SLC caches.
The purpose of a DRAM buffer is the controller keeps a table where it maps addresses of the NAND chip in a certain fixed ratio, and clears them as necessary. So a 1GB DRAM on 1TB SSD means it has 1:1000 ratio. So in very simple terms, 1 byte in DRAM has to contain 1 location in NAND, and a page in this case is 1000 bytes.
So even on SSDs, it's all about the DRAM.
DRAM is anywhere from 50-150ns. It's incomparable. Who cares about direct CPU connections when you are that slow?
Not to mention your fancy combined drive will die in a few days because DRAM is essentially unlimited while NAND is severely limited and needs all sorts of tricks such as wear levelling. Optane DIMMs showed promise because it had 200ns random reads, and 500ns random writes, along with the 5 year warranty for 24/7 writes, which would work out to be in the 1-10 million cycles per cell range, or 500 Petabytes for a 256GB Optane DIMM. At 500x the random read speed, it came rather close to the "1000x faster" claim.
The really old MLC SSDs with much more robust 60nm lithographies were in the 10K cycle per cell. Now you are talking 1-3000 with TLCs.