This new 40TB hard drive from Seagate is just the beginning—50TB is coming fast!
(www.techradar.com)
I just addressed that in a post above yours.
https://lemmy.world/comment/17434700
Basically, smaller form factors are probably just better in this case. 3.5" drive bays were designed with more complicated mechanical drives in mind, and given how nand flash memory works, they don't make as much sense for SSDs.