I never understand this argument about the "right" way to play the game, which comes up from time to time on this forum. It's a single-player game, why do you care how other people play it? And why do you get so emotionally invested in it? Isn't that the whole point of Hitman, that it's an open sandbox and you can play it any way you want?
Personally, I don't play with explosives or extinguishers unless it's a challenge, but I don't disparage anyone who does. In fact, I enjoy watching the video run-throughs. I marvel at how they come up with this shit.
I wish they rewarded my playstyle, which mainly consists of hiding in the bushes for 20 minutes and watching the guard patrols before entering the building. I'd be at the top of the leaderboards. But that's the way I play, and I enjoy it.
Not to mention, those runs aren't easy. I watched @AlexNiedt's elegant run on the old lady ET in Marrakesh and thought "Shit, I can do that." About a minute later, I was bleeding out in the dusty streets of Morocco. First time I'd ever been killed during an ET.