Just out of curiosity, is there a point to the TR 1900x or does the R7 2700x make it pointless?
Furthermore, does that go double for the R7 1800x too?
No. Threadripper still provides quad-channel DDR4 Memory and 66 PCI Express Gen 3.0 lanes...so it depends on your usage.
I see, thanks for that, but the 1800x is over shadowed by the newer 2700x?
In terms of performance, yes. Price to performance is debatable since you can find 1800x combos with cpu, mobo, and ram for as little as $400. Where a new 2700x will run you $300+ for cpu alone.
Unlike the x299 platform x399 isn't locked down by your cpu. Every Threadripper CPU has access to all 66 PCI-E express lanes and quad channel ram.