Det has a far lower importance in 3.x than it did in 2.x. Changes to it mean that even melding with nothing but det will barely influence the heals from your fairy so it's a waste. Crit is a great boon for most spells & is what I concentrate on where possible. I also like a lot of accuracy because even outside of end content it's possible to miss on things like hunts & that's a bit annoying. Before they changed the EX dungeons like Antitower back to low-accuracy it was a nightmare seeing Energy Drain missing.

Obviously the Dervy quote has INT instead of MND & is a mistake. It should be WD>MND>CRIT/SpS>DET with crit or sps being up to you, depending on if you are intending to heal better or DPS better (no brainer for me - heal!). Accuracy should be capped if you can.