Agreed, but while HSL is surely more intuitive than RGB, it is still a relatively crude tool because the numbers typically aren’t calibrated in any useful way.
After studying colour theory for a long time, I became convinced that the most interesting colour systems are often those based on actual human perception rather than “arbitrary” physics or mathematics. See for example Munsell’s work[1], which is built around perceptually uniform changes as the values representing colours vary, or the Opponent Process theory[2], where hues are represented in terms of red-green and blue-yellow axes rather than placing three primary colours at the vertices of an equilateral triangle and then interpolating into a circle.
Personally, I have found the perceptual systems more useful than RGB or a traditional colour wheel and something like HSL built on it, particularly for technical/mechanical tasks that require generating variations of colours starting from one or more known anchor points like colours lifted from a photograph or a client’s branding guidelines. I think you always need a human touch, though: all useful colour models have multiple dimensions, and there is definitely both skill and art in making choices like whether to vary each dimension by large amounts, subtle but visible differences, or not at all.
Sadly, I fear we’re still many years from calibrated/environmentally-aware display devices being the norm. That means for something like web design, the majority of visitors to most sites are going to see all those lovingly chosen colours on a poorly calibrated screen that may scarcely resemble the original designer’s choices anyway, so to some extent trying hard to refine a colour scheme at the above level is mostly wasted effort, at least for now. Such is life. :-)