With my personal desktop (2x 1TB NVMe drives), they're mirrored with ZFS for data integrity. Depending on what Roark66 has them mirrored for (speed vs data integrity, etc), the alternative single-drive approach might not be workable.
> If I got a new MB I'd definitely want at least two nvmes in a mirror(for speed)
raid1 is a mirror, and can have speed benefits over just a single drive (able to read from multiple drives in parallel).
But yeah, you might be right. When talking casually, things like "mirror", "raid" etc can be a bit fuzzily applied. :)