Yeah it’s hard to imagine watching that video and thinking that the attributes affect the balance of the game in the eyes of the designers. He outright says that the mountain dwarf is balanced around having 2 +2s, not around where those +2s are assigned.
I’m in the same boat, having mostly players who are less crunchy than I am. And yeah, he’s an incredible DM. I mean I may have a bit of a celebrity crush, but like come on have you heard his “dangerous bad guy” voice!? It’s like Michael Keaton playing a gunslinger!
My group is too in love with rolling to use PB, and too into customization to use array. I am considering pushing for 6+2d6 going forward, though. Now we use 4d6, reroll 1s, drop lowest, and then if anyone is meaningfully below everyone else they can roll a new set or let the DM roll them a set.