You're not wrong, but I haven't heard anyone worry about TRIM in years. The drives have become pretty darn reliable. How much data changes on a daily basis or between backups? Two drives means larger workstations, etc. Just wondering what the other logistics are here.
The testing methodology is a little different, we debated putting the 860 EVO on for instance, but it's apples to apples with a bite missing so we opted not to. You could pull the reviews side by side to compare with the understanding the QLC drives are tested more gently.
Overall the XN5004T offers quite a bit of flexibility and performance in a small NAS. There's only a single SSD slot but QSAN makes the most of it, enabling dedupe, compression and caching, which is a nice inclusion for a 4-bay NAS. Further, the PCIe expansion slot enabled more use-case specific options like 10GbE.
QSAN XCubeNAS XN5004T NAS Review
We've seen a lot of road maps, but none lately for end user HDDs. I really think WD/Seagate have conceded 2.5" SATA to SSDs. I'm figured out a path to live on a tiny SSD and NAS/cloud services. I prefer this actually in case of an SSD failure.
I really wonder how many of these SDS solutions can find a path to viability. Lenovo is partnered with like a dozen software partners and Dell is almost the same. Doesn't even count guys like this who have largely partnered with the white box guys. I guess Micron never figured out how to make Excelero work as a product. Probably a good thing, selling arrays isn't their jam.