These champs dont use the stats? Jax Q,W and Ult has AP all scale with both AP and AD, and he makes great use of attack speed, not to mention the fully stacked effect makes his ult hit every other auto instead of every 3, Xin has AP ratio on his E for damage and it increases the amount he heals by on his W and uses AD on his Q not to mention again fully stacked it makes him heal on every other auto attack instead of every 3 from his W meaning he gets even more effect out of the AP scaling. Master Yi is the ONLY one that I mentioned that doesnt use all 3 stats that the item gives perfectly as his only AP scaling is on his meditate which requires him to obviously not be attacking which means losing the stacks.
Guinsoos is a Hybrid item and like all Hybrid Items it is usable on a very limited number of champions, but on those champions that can use it it is extremely effective. Also ONCE AGAIN, Guinsoos is not an item that gets built first, just like IE and just like deathcap you do not build it first because just like IE and just like Deathcap it is better after getting other items that synergies with it.
You are right though, you dont NEED Rageblade on these champions to make them good unlike champions that use crit who NEED IE to be good. Unlike champions that NEED IE there is some variance to the build of champions that are able to utilize Rageblade and thats a good thing, an item should not be a MUST build for any champion that can use it thats the kind of thing that created the sated devourer meta aka the same exact effect that rageblade has now but cheaper which made it op as shit.
EDIT: and the reason I gave you a 'k' is because you had already said
"By the time you get 6 autos off and get the full effect, either you are dead or your tatget is dead, assuming you don't use minions to stack it."
To which I replied
"Jax Kayle Xin and Yi are all easily able to get 6 autos off before dying unless you are super far behind or are building wrong."
and then all you did was repeat exactly what you said before adding nothing new to the arguement you just began to speak in circles
"As for jax, kayle, xin, and yi, none actually need to build it, as within 6 autos more often than not your enemy would be dead anyway."
After I had already fucking told you that they can easily get 6 autos off. You act like everyone in the game is a squishy champ, tanks exist, other bruisers exist, not everyone is an adc or apc that dies in 3 hits. If im fighting a fiora or a irelia they are NOT going to die in less than 6 hits and the ramping up of a Rageblade can quickly turn a fight around, it can make them think they can win, only to find out that the fight lasted too long and now my stacks make it so I win.