Dal gives way more mettle than any other source. So if you're trying to farm mettle for honors, it's still a good target. Also if you don't intend to build more relics, Dal is a better target than DR.
It all depends on what you're trying to do.
Also yeah, I calculated that even if I were to run DR every day between now and Endwalker's launch, I'd still be about a month short on timeworn artifacts. That's absurd. Drop more of them.
