DBW is "quite useless" since STS is a thing.
More stats, 66% of the time the proc is superior and it even has better uptime.
Your other slot is always going to be tiny abom, even if you'd overcap hit so bad you'd not use anything but the passive.
DC HC/WFS HC are also superior to DBW, but for the sake of simplicity let's just assume nobody does togc or icc10hc due to the entire raid offering like 3 items in total worth the effort.
You just have to understand DBW is by no means "unuseable" for a retpala. Many people I raided with ended up using for "for the memes" every once in a while and it's definitly not like they dropped off like not using a trinket at all. It's just so bad compared to other readily available options you have to be prepared to face consequences from other classes which actually use it. (And as a sidenote - most classes would gladly replace DBW with something else due to how bad the uptime/proc-lineup is on that thing. If there was an option for them.)