Eh, 2-12 is still no more that 0.5 average increase per attack from 1-12. But yeah, I can agree that it's gonna add up with Monk's attack counts, but I still think the damage increase is not that significant. I think the main benefit of Travern Brawler lie in Push.
I don't think the reroll 1 is that important. It more or less just makes your martial arts die become 2-6 instead of 1-6, effectively increase average damage per attack by like, 0.5?