Dude what?
Runes/masteries took thought? You´d take a gander online and suddenly youd find what the pro´s would use in 100 games out a 100.
And chances were, they´d use the same setup for those two in 80-90 outa all those games, only sometimes did you pick a page that had more armor or more magic resist in midlane for instance when dealing with something like old LB to avoid dying instantly at lvl 3.
Jungler order is no different, top tier jungler back then could easily clear whatever they wanted whenever they wanted, and now that is the truth as well.
Only difference is that some junglers currently struggle to clear raptors and krugs well, and thats about it.
100-0 was faaaaar more common, almost every damn assassin was nerfed because they could do it, several divers and juggernauts got gutted for doing it.
Even tanks ate repeated nerfs for doing it, even if the end result was that instead of instantly killing a squishy they just stand on them and kill the squishy eventually while not dying themselves.
Think about how to splitpush,group or siege? Yeah because there were a lot more generalist picks and builds back then, you´d simply go and do whatever suited you the most.
Now champions and teams have more defined strengths which cause them to do somethings better, so naturally they wont think and just go for whatever they are good at.
And while there are issue´s you missed the marks by a long shot ._.
Go watch the dissusion video Hashashin made for February 6th, it was good enough to get him a temporary spot on the design and testing teams and he goes through exactly what´s different and whats bad.