No no that's not how it works. There's no indication of a skill requirement from that graph, instead you'd have to look at a bell graph of performances, which is a different matter entirely. I've played holy for 10+ years and there is almost zero skill cap currently.
Let's switch it up to 99th percentile and you can see the problem is exacerbated. This further proves if you're playing to an extremely high level of play, you're going to do
even worse against other classes also playing at 99th percentile levels.
https://www.warcraftlogs.com/zone/st...hps&dataset=99