Completely understand, and we do back up Drobos and external drive bays as well, but opening it up to NAS, Servers, and Linux would not work out well. That said we're constantly running modeling on it, but for now we send folks to Backblaze B2 and most folks tend to be pretty happy with it. Plus with B2 + Backblaze Groups you can centrally manage those backups as well, so you still get the web-usability of Backblaze, just need someone else' client to tie in to B2 (or roll your own w/ CLIs and APIs).
Sure, but the % of users with 8TB drives—and the connectivity to push that in the first place—would be low enough to still work out favorably for them.