... and It is ok.
I bought 16TB disk because I needed that much storage.
If I were using, say, only 10TB, I would be wasting 6TB.
I can expand my LVM as much as I can. But I definitely want my disk to be full. Same goes for my RAM.
And I want my CPU ide time to stay as close as possible to 0% and my load average as close as possible to my no. of CPUs.
Anything else would mean oversizing and overspending.