Arguably rules and regulations have changed too, to affect this. Back then they also refueled the car during pit stops. This has not been the case since 2010.
I believe that recently they have added a regulation forcing a sort of buffer time between the ready sign and when the car may leave
Crazy that the pit crew were just wearing shorts and tees and not even a helmet. They act like collisions and fuel spills have never happened before in the pit lane.
Red Bull is consistently fast the past few years but that McLaren lit last year was amazing. Especially after the rule changes in recent years to try and slow down the pits for the sake of making sure the wheels are safely attached
It isn't as chaotic as it looks. Going in the pit everybody is prepared and shouldn't be any problem. Going out there is a mechanic that signals when it's clear.
Sometimes there are screw ups, of course. Some bad and others quite funny, like when the driver stopped at his old team by mistake!