That’s just how the ability works, no talent points required. SotR does a bit of AOE damage, reduces Holy Shock CD by 2 seconds, and restores some mana, baseline. So if you don’t need to spend that holy power on a heal right this second, it’s very valuable to just send a SotR for the damage and mana regen, since it will also give you Shock (and more holy power) back faster, too.
As Freyrson said, taking Shining Righteousness will now give you a massive chance to just get a free spender after casting SotR anyway, and you can keep proccing it and spamming SotR back to back to back sometimes, regening a ton of mana. This makes Lightforged Blessing a lot better, too, to maintain health pools while doing damage/regen rotation.