I think it’s an interesting turn for the Mandos. George really turned the established Mando culture on its helmet when he decided to tackle them in the Clone Wars. After his departure Dave has slowly brought them more back in line with what the EU had established.
From what we’ve seen so far, I think the evidence would suggest the Empire nearly wiped them all out. And the survivors believed the reason for this was the abandonment of their old ways. And so now they’ve rededicated themselves to those ancient ways that made their people great originally.
I’m really enjoying these glimpses of their current society.