News Spectra Cube heralds new 75,000 TB storage library — tape solution for cloud providers is optimized for ease of use and versatility

With archive capacities ever increasing, I'm surprised that the LTO physical media format and tape robots (or worse, manual tape-swapping) for increasing capacity-per-head have not been superseded by physically larger tape carts/reels holding far greater lengths of tape.

Basically: where's my IBM 729 storing petabytes rather than megabytes?!