[akvadrako]

If your fragments are really small like 16kb then you could see a significant performance improvement, due to better predictive loading and packet overhead. This is clear from SSD benchmarks.

But I don’t see how this would ever realistically happen.

[forapurpose]

What about the massive effect on wear?

[tinus_hn]

You don’t know if there is wear. The controller is a separate computer. It may be clever and just remap blocks if you copy or move them around. It could be that defragmentation allows the system to work in a way that is better for the controller or allows that controller to place the blocks in a better way.