Happy to help.
Okay. I just want to emphasize that it's not really situational and doesn't put severe limitations on you.
Even if you choose to go full aggro and just play like a pure smite machine, it's an excellent ability just because of its usefulness against alpha strikes and multiple foes... both of which are pretty much the main existential threats at level 20. The value from that alone is enough to make it a great capstone, before you even count any benefits you'd get from shifting your priorities.
And unlike so many Paladin capstones, it's action economy free.