Prot Paladin Questions: Defense and Reckoning

Howdy Fellow Paladins,
I have heard before, and seen in other builds, that Reckoning is a must have for a Tankadin. However, none of the tankadin builds I see on the forums recently put points into it. What gives?
Also, back in vanilla (from memory and old forums), Defense didn't seem to be a big must have for paladins. But on this forum, I see defense in the prot talent tree, and on every BIS pre-raid item. Is it a must have on Nost?
Thanks!
I have heard before, and seen in other builds, that Reckoning is a must have for a Tankadin. However, none of the tankadin builds I see on the forums recently put points into it. What gives?
Also, back in vanilla (from memory and old forums), Defense didn't seem to be a big must have for paladins. But on this forum, I see defense in the prot talent tree, and on every BIS pre-raid item. Is it a must have on Nost?
Thanks!