Paladin Hybrid (Preg?) spec

I play both SoloQ and 2s, and I see everyday more and more paladins with this weird spec.
Basically if you don't know what is it, it's retribution spec without crusader strike and divine storm, and then protection tree until the 1hand specialization talent.

I saw many times huge, unhealable damage even from starter gear paladins.

I want to ask you why is this a thing now, is it better than the normal 2hand retri spec (maybe with SM) or what?

What are the cons and the pros?

Thanks for reading.

The reckoning build has less dmg than a pure ret paly but more heals. When paired with a disc priest it's a strong setup because the reckoning paly can keep the disc with strong off heals alive and deals massive dmg in the mean time.