> Interesting, is that because of the load? It seemed "modern" SSDs have GCs good enough that trim isn't quite necessary anymore to ensure good performances in consumer loads.

A drive has no way to tell whether filesystem is using a given block or not. TRIM is a way for the filesystem to tell it that. So I would imagine the GC that you're referring to is working on the blocks marked with TRIM.

BTW, besides running fstrim from cron on Linux, you can also use discard flag to mount the drive, so the filesystem sends TRIM command when files are deleted.