Seagate had some 5tb smr drives that I started picking up a few years back. Write are slow at sustained 8-12MB/s. But reads are fine. I wouldn’t expect these new ones to be any better.

Still not as good density wise in a 24 sff disk 2u server compared to a 12 disk lff 2u server with 18tb or 22tb disks.

I doubt think these are even SATA, anyway. The last WD 2.5" external drive I opened up had its micro USB 3.x connector attached directly to the PCB, right where you’d expect an actual disk controller interface to be.