if you think thats a 10/10 mirage window jump then i understand why you dont see that its a problem. basically you can make it in a couple 10ths of a second less if you make a tighter arc and if you do it perfectly, you dont have to crouch and land on the apex of your jump against the railing so you stop immediately and then you are immediately accurate. with awp it doesnt matter as much because you have to wait after you scope anyway unless you go for the RNG play like you did, but if youre doing it with another weapon that can really help.
you can abuse the same mechanic on dust2 mid, if you jump on the pallets next to xbox you need to crouch, if you immediately bunnyhop off it while you land crouched and uncrouch at the top of your jump and tap A, you will land on the xbox without falling down and you can instantly shoot accurately at a ct who is waiting on short. it doesnt work if you wait on the pallets though, you have to bunnyhop on it.
it also works at ramp at A site dust2 and jumping on the box at vents on mid on cache. basically any spot with a ramped floor and something to jump on. if you dont fall down you dont gain inaccuracy from falling. if you crouch while making the window jump then you gain inaccuracy and it takes longer to land.