Where do you add more storage after you've used your 1-2 nvme slots and the m.2?

I would think an SSD is going to be better than a spinning disc even with the limits of sata if you want to archive things or work with larger data or whatever

Cheaper, sturdier, and more easily swappable than NVME while still being far faster than spinning discs. I use them basically as independent cartridges, this one's work, that one's a couple TB of raw video files plus the associated editor project, that one has games and movies. I can confidently travel with 3-4 unprotected in my bag.

There's probably a similar cost usb-c solution these days, and I use a usb adapter if I'm not at my desktop, but in general I like the format.

> Maybe a boot drive for some VM host?

Actually that's a really common use - I've bought a half dozen or so Dell rack mount servers in the last 5 years or so, and work with folks who buy orders of magnitude more, and we all spec RAID0 SATA boot drives. If SATA goes away, I think you'll find low-capacity SAS drives filling that niche.

I highly doubt you'll find M.2 drives filling that niche, either. 2.5" drives can be replaced without opening the machine, too, which is a major win - every time you pull the machine out on its rails and pop the top is another opportunity for cables to come out or other things to go wrong.

I bought 2 of the 870 QVOs a few years ago and put them in software RAID 0 for my steam library. They cost significantly less per TB than the M.2 drives at the time.