Why do tanks no use coold downs?

[Elamys]

Sadly I've had a tank actively refuse to use cooldowns. It was a DRK I got in Expert one time in Ala Mhigo. He wasn't fully geared yet (it syncs to i310 but he was wearing some i290 and i300 gear) and wanted to do double/triple pulls and he died multiple times because he used like nothing (except Living Dead, but he died anyway), he was taking so much damage I had to spam Benefic II without missing a single GCD until I ran out of MP so he died anyway.

I feel like I've had this exact same DRK because a few weeks ago I was healing Temple of the Fist with a DRK that used literally zero CDs. So actually somehow worse, i guess.