Hell again in '09 Pornhub was working easy on the same stack with only 
a few servers (when you consider the visitors).If you ask me most of what was "invented" after 2004 is 
stuff invented by Google/Facebook who are realistically the one ones needing it, but they noticed an opportunity 
to scoop up market share in dev so that they marketed their stack as "bleeding edge".
The one factor bleeding is my eyes once i see something that could 
possibly be wiped up in an ordinary PHP/Python/Ruby stack however 
instead is made with so many dependencies and 3rd occasion library that you simply surprise if the dude who wrote it truly knows programming or if he just glued 
cool techs together because Techcrunch and HackerNews 
say they are cool.But yes, the smaller players are often using outdated stuff, 
then again 99% of the web is. Hence why Wordpress is still a thing.And as 
a former Lead Dev of Pornhub, I can assure you that tech peeps 
definitely are aware of the bleeding edge of tech, just that almost all generally tend to not buy the hype.