[Mashimo]

I compression not on by default nowdays? Anyhow, I would not run ZFS with compression disabled completely. There are edgecases where you want it. The meta data? I can't remember the details. At least active the compression that just compresses zeros.

[npteljes]

I enabled it for my media storage, knowing that it wouldn't matter much, and indeed it doesn't. Compressratios are 1.00, 1.00 and 1.01.

[Teknoman117]

Since you can control compression settings per dataset, I'd just use a separate dataset for the videos directory with compression disabled.