kha zix's isolation should be reworked into a mechanic that actualy works

90% of his ballance problems comes down to things caused by isolation

either he is op and isolation is just a bonus, then people actualy play him ecuase he works or he is up because he needs to rely on that isolation, ofc when he fights an isolated target he works as intended, but he cant get isolated targets

as an assasin kha zix is the most gated champion ever when it comes to doing his job its easier for yasuo to ult when his team doesnt have any "knockups" and he doesnt use his tornado, than for kha zix to get that isolation for long enough to assasinate (yasuo can ult from any displacement, like hooks/grabs, champion made terrain, quinns distruption etc )

so the thing is that isolation is a core thing for kha'zix, but its too bizzare and restrictive to allow him to function in game, thats why kha zix is only viable when his kit is op enough in itself to work without isolation at all

So it seems logical for me that kha zix's isolation should be manipulated in a way that allows him to archieve it more often

The most simple things that i can think of is that one of kha zix's abilities forces an isolation on someone for a certain time (preferably his passive), but thats just a suggestion