Re:
I've yet to watch that (no time at the mo or I'll be late setting off to ride) my mate used to have bars so narrow on his dawes commuter back in the day, he could fit either brake levers, or shifters, but not both, on his bars, so he converted to old road style shifters on the down tube haha!
I love my wide bars these days, makes you/me wonder what we were thinking back then, but then again some can be 'too' wide..
I saw a comment on a Facebook group last night "wide bars save lives" and I didn't reply as you get drawn into silly internet arguments that way 'my opinion is better than yours' and such.
But I rode a trail a few months back with some of the local-ish chaps from here, on my '18 stumpy and we were flying down one tree lined section, which suddenly narrowed into a little bridge over a stream/drainage ditch, and it was covered in ivy and other woodland growth so I only realised it was there as I flashed over it @ 20mph+
Not a problem for my 700+ mm bars on the stumpjumper, but if I'd been on my '19 pace hardtail with its 800+ mm carbon bars, they would have 100% struck the bridge and I would have been in a very broken/upset heap...
Wide bars would not have been saving lives there