Seeing as how most premium laptops today are using some sort of PCI-E storage... I would say professionals that are using their laptops as workstations care. This isn't an interconnect made for external use per se, but for replaceable storage. In the article it specifically is mentioned as a replacement for soldered BGA storage. The way the mechanism works (which is very similar to old full size SIM card slots on old feature phones) is meant to act as a more permanent socket than something like a spring loaded SD card slot or USB port. It's more akin to a CPU socket.
For laptops and tablets this could be a huge move, partially because of the user-serviceable upgrade potential, but also because of data recovery. Instead of the flash chips and their controller being on the same board as the CPU, GPU, muxes, power management systems, etc, they can now fit in a secure, low profile and low footprint socket. Take newer MacBook Pros for instance. They have soldered on storage and no way to access that data if the logic board dies. Previously, Apple had outfit the board with a "lifeboat" connector that allows for data transfer from the soldered on storage (assuming it's still intact) without having a fully working board.
Louis Rossmann, of course, went over this in a video just a couple days ago. He had a customer that sent a machine in that is a few-months-old MacBook Pro 13". It has a dead T2 chip which renders the entire logic board useless. There is no way (short of desoldering the flash chips and possibly putting it on a working donor board, but then you run into a whole slew of other issues) to recover data off of that machine.
https://www.youtube.com/watch?v=gi9en4I-tjA