While your statement is true, the result is Steve Vai not having a motivation or reason to become the top apple picker. If his extreme efforts to become the best in a given field are nullified by a system that will give extra to someone who isn't as good at it so that they can be as good as Steve, why bother with putting in that effort?
So yes, Steve is harmed by stealing his motivation and (potential) recognition by making the system anti-meritocracy and more about everyone being the same.
The equation changes when we live in a post scarcity society, but we didn't live in one. Therefore we have motivational pressure to find a niche we are good at and exploit it to survive. Taking away that niche you might be talented at while others aren't as talented, harm those people who now don't have that niche to exploit.
Even in a post-scarcity world, where we have unlimited access to energy (and thus can create anything we need), the motivation for social recognition through innate talent and ability is going to drive the human race forward. Taking that away kills the human spirit and possibly the human race.
I bet you are against designer babies/gene editing to give a child a huge advantage over it's peers, right? Because that is the logical conclusion of this metaphor and "justice." Genetically engineering every baby to have equal access to abilities and talent.