short answer: Shaco has lots of fans, fuck up shaco, PEOPLE WILL BE PISSED
Detailed answer
Shaco is a champion who is very old, but despite that to this day is one of the most unique champions to be no the rift, in both design and in play style. Shaco has two primary play styles that consist of what some like to call "Ap trap master" Where the play style revolves around your AP scalings and you rely on poking out the opponent and guiding them into a death trap of your boxes. The other play style being FULL ad cri tassassin, where you perma split push and through how you scale be capable of one v oneing anyone to even one v twoing. He is a ferocious split pusher and because of his ultimate if you leave him alone with a tower, your base can very easily be gone.
He is a old champion that had a toolkit far ahead of his time, and because of that he has a large and healthy fan base. However shacos flaws are quite obvious.
A-His shiv is great but riot is clearly uncomfortable in how they want to balance it's damage.
Passive: His passive is wack, simple as that, but very unique that promotes a sneaky play style
Boxes: Very cool, but feels like they can be so much more as of late
The thing is about champions when reworking them riot must ask themselves the following questions
-What is wrong with the champion
-What is the champions core identity so we don't accidentaly remove it
-Does his game play properly reflect who he is?
-What is wrong with shaco? slowly but surely falling into the out dated list and has horrible team fight presence
-does his game play reflect who he is? Could be improved upon with visuals to show he is the demon clown, other than that he's solid
What is his core identity? And this is where things get tricky, as far as i'm concerned when you think of shaco you think of everything. You think of his daggers, you think of his boxes, you think of the fact he can summon a clone of himself, you think of his stealth popping out of nowhere mechanics. In almost every rework it was obvious in what the identity was. For shen it was his teleport, for Galio it was his ability to taunt and get infront of everyone as a shield, for sion it was him running in and just fighting. For all these champions they had one key ability that made fans go "that's my champion" which made it easy for riot to do the reworks..but for shaco..it's everything he has that the fans love. which makes the shaco rework so very complicated for as a designer you look at shaco and go.
"idk what i can remove or alter without making the fan base hate my gutts"