My drive gets almost full relatively often.

> If your drive is over-provisioned (eg 960GB instead of 1024GB) then it's not needed.

I disagree. That much space isn't a ton when it comes to absorbing the wear of background writes. And normal use ends up with garbage sectors sprinkled around inflating your data size, which makes write amplification get really bad as you approach 100% utilization and have to GC more and more. 6% extra is in the range where more will meaningfully help.

> Leaving 100GB of 1TB drive is like buying a sneakers but not wearing them because they would wear.

50GB is like $4 of space the last time most people bought an SSD. Babying the drive with $4 is very far from refusing to use it at all. The same for 100GB on a 4TB drive.