This is a strange take, sorry, OKLCH is simply better and it's not that complicated to understand?

OKLCH is as you say unambiguously better and IMO easier to understand than RGB, where choosing relative adaptations of colour is basically pretty fraught.

Alas, in terms of the software people use to mock up designs, very few desktop apps support it. HSL is, for now, the more practical option.

Perceptual colour spaces are emphatically not “simply better”. They’re better for most colour mixing (which is of more limited application than you may think) and for some sorts of intuitions, but their shape is far more complex, not mapping to the actual screen gamut in any predictable way, making them highly obnoxious for colour selection, because it’s super easy to fall out-of-gamut without realising it (and I don’t know of any tooling that draws your attention to when that happens) so that its entire purpose is compromised, and they’re downright atrocious at handling vivid (near edge-of-gamut) colours.

Take bright yellows as one of the worst examples. Basically the only thing you can do with them is reduce the chroma: any other change will take you out of gamut. As the most extreme case, #ff0 is approximately oklch(0.968 0.211 109.77), and the following minuscule modifications will take it out of gamut: L + 0.0002, L − 0.0001, C + 0.0002, H − 0.009 or H + 0.025.

This is why the creator massaged them into a cube/cylinder: https://bottosson.github.io/posts/colorpicker/, Okhsv and Okhsl. Those are much closer to being uniformly superior to sRGB.