I donmt get why jett is good

[wintry hull]

I really want to know the answer to this, how does jett get an advantage in any fight

[spring kraken]

well yes, you have her dash which can get like one pick, but its also gamesense, like if its a 1v2 on lets say lotus a. jett playing post plant in tree planted default for tree. lets say someone is at drop. she can curve her smoke into drop to isolate 1v1's and then get picks, another thing is she could peek out and get a pick and quickly flick down and smoke herself for cover.

[wintry hull]

I guess so, I just don’t know why some 3.5 second smokes and movement abilties allow people to pop off when its kinda still dry 1v1 just isolated

[crisp gust]

firstly you can get 30+ kills with anyone, your fundamental FPS skills work on any character if youre good at val, you got the same gun

as for jett, shes still one of the top agents because she has the lowest risk taking an initial kill of any agent. no other agent allows you get out as safely as her dash, because unlike reyna you dont need to hit the shot, and unlike chamber you dont need to preemptively set it up, so its more versatile.
this allows you to be hyper aggressive and take duels super early or from 'dangerous' positions that people wont expect. this is especially true for the operator. if you OP with other chars, you either need to be a little passive, or you inherently take risk because you can get traded or punished by util while trying to get away after taking that first shot.
the smoke isnt just for isolating 1v1s or repositioning either, you can make one ways anywhere which gives you advantage, smoke yourself and play a shorty (jett's best friend)
watch high level jett gameplay from basically any duelist pro player in ranked, aspas, oxy, derke, something, etc etc and actively pay attention to the positions they play and the gun fights they take, a lot of it is literally impossible on other agents.