The point is, assuming you can sustain the clock speed (which alot of laptops can, when the TDP is unlocked) you can get significantly more performance.
As for 20 PCIE lanes, its something for people who are interested in it, more is always better I guess. There really isn't a reason to dunk on...
Ok, but my point was you're overspending where you don't need to, if you're going to spend $4K it better come with a 2080 Ti, if not just chop off the unnecessary stuff. You don't need to waste a quarter of the mans budget on useless audio gear, you didn't even address my other points
If it's M.2 SATA, you can just grab a M.2 SATA to 2.5 caddy. If it's M.2 PCIE, you can get a riser card but whether it will be bootable or not will depends on your board. Regardless, it still show up as a storage drive in your OS
Was a OCZ Vertex 4 (MLC 512GB SATA SSD), just sold it to a friend for a good price, so after that, probably my HDD's? If not my GPU, but they're all fairly recent. If we're including monitors and the like, definitely my HP ZR30W, got it for a steal a couple years back and it looks amazing still.