What is Maran status going to do? Perma-fly.

That's pretty much it. And as you said, trip spam isn't going to win a fight alone, that isn't really a deal-breaker in and of itself.

Second virtue? What about their first virtue? What if their second virtue is useless for PK? What if both of them are? Or what if their first virtue is perfect for the situation.

Put it another way. What is the combination of virtues that will save a paladin's ass, while without either of the virtues they would be meat? And further, how many paladins had that exact combination?