You're absolutely right about hard disks like this being essential to our current computing capability.

But in the personal computer space, very few people need lots of storage, so they will not "feel" any difference between 2TB and 20TB of hard disk space.

Even between SSDs, while some are undoubtedly dramatically better than others, for the average person they wouldn't necessarily notice that their notebook is ever so slightly faster to boot up or load their browser.

More advanced CPUs tend to have a much bigger effect on their day to day computing as their computer will feel faster and be able to run longer on batteries.