An IDEA for balancing khazix
Before going into the topic, khazix is still fine even after the nerfs, he can still make plays and still is a dangerous assassin. Its just an idea, im not criticizing anyone, just an insight that may or may not be of the slightest use for riot. As mentioned in patch 4.18, "In the case of Kha'Zix, Q was designed to be his main tool when assassinating targets", yeah you are right, but in any game how many times does khazix gets the opponents isolated? so that evolving his q, actually has an impact in his potential to assassinate? well his q does serious damage to isolated targets(no doubt), but in a scenario were team fights are predominant or its hard to get people isolated since they know being isolated is dangerous, i dont think his q evolution does anything, except if the team fight went in their favor and their is only one more opponent.
alright, coming to the point, according to the patch, by nerfing w, q gets prioritized, well i think it must be the other way around, by giving his q something more meaningful, you could influence people to play khazix as he should be played, instead of nerfing all other abilities, its like forcing them to evolve q, nerfing w isnt a bad choice, infact its good, but give him something when hes lost everything, because, evolving r doesnt mean anything now, evolving e is super good, so the only options left are his w and q, and since w can be used for its utility, poke and wave clear, they opt it first.
MY CONCEPT FOR BALANCING KHAZIX: To influence people to prioritize evolving q, doesnt necessarily mean you have to buff his q or nerf his other abilities, lets say for example, evolving his r, reduces the isolation range, there by increasing the chances of making his target isolated, then people do have to DECIDE according to the situation, like what to evolve? and in which order?, this idea definitely changes the way people play him, and as for your concern, q does gets prioritized followed by r and e, or w when there isnt much wave clear or utility in the team, it will pretty much become situational, rather compared to nowadays standard w-e-q or e-w-q evolution in which case r is no where to be found. Or make his evolved w reveal stealth, if it is implied with the above concept, it surely does become situational for his evolutions.