yes, going on stairs is much smoother
maybe because they love this game?
if are dedicated to something, then you probably won't switch to another game
Yes, but no, it isn't worth it because you're playing a non-competitive game, but if you want to, then go for it, it's your life and your decisions.
It is up to you.
1.6 is much better on a 144hz monitor in my experience. I play older games like HL and condition zero for nostalgia and they definitely feel much better on my new monitor compared to my old 7ms 60hz HP monitor.