Isn’t Iron Fist just a fossil of the 70s kung-fu craze, with no more modern relevance than say, Night Thrasher?

Hey, Night Thrasher will always be relevant as long as “nineties kid” nostalgia persists!

I mean, I guess Iron Fist’s relevance comes down to how enduring you think the 70s kung-fu craze was and is. I would argue that it’s been both multi-faceted (not just the shift in action movies for martial arts to be the new foundation, but also pretty much everything the Wu Tang Clan ever did, a good bit of the cinematography of Tarantino, the Matrix, and on and on), and surprisingly long-lasting (thanks in no small part to Hollywood being able to tap into Hong Kong/Chinese cinema every few years to find some new trend to borrow).