Nothing really changed in development, ZFSonLinux team was actually one of the more conservative in terms of data safety, what changed is that a bunch of things

Nothing really changed in development, ZFSonLinux team was actually one of the more conservative in terms of data safety, what changed is that a bunch of things that were really long in the works coincided in reaching maturity. If you want "feature chasing", FreeBSD ZFS TRIM is the ur example. I've read that code end to end... and I'll leave it at this.