From 10(avg) bench clearing brawls per year to none in 30+ years is significant, and it was legislated out of the game for a reason(the obvious danger to everyone on the ice). That's not even accounting for line brawls(just the 10 players on the ice) which still happens, but is a once every few year thing rather than a regular occurrence like back then.
Curious you posted up a video that points out in the conclusion what I was originally alluding to - rats ran around in the 80s/90s just fine despite the threat of getting punched in the face, some of them were far worse than anyone that is in the league today could ever claim to be(Marchment, Samuelsson etc). I probably should have clarified it better in my original post, but the point was that fighting was rarely a deterrence(especially if you were the biggest, meanest fighter on the ice), usually had escalating consequences, and wouldn't have prevented Bouchard from taking that hit into the net(Impulsive people rarely think about consequences when they're doing impulsively dangerous things in the moment)
You're mostly arguing something else though, the fact that hockey has become a mostly non-contact sport these days doesn't really have anything to do with fighting or the old school idea of players policing each other. I'd like to see more hitting in the league too, but it's not going to happen. You could probably point to things like the headshot rule(which the NHL absolutely needed), bans in the development leagues, and punitive fights for hits, but I suspect the real reason is that hitting(especially going for big hits) is just an inefficient tactic in a modern league where everything revolves around systems and positional play.
It's probably only going to get worse on that front as well as fighting is already starting to get banned at the Major junior level and below. Hitting bans which are already a thing for 10 - 15 year olds are being recommended for anyone under the age of 18(Including major junior leagues) by medical professions(and likely league lawyers looking to avoid CTE lawsuits).