Maybe I'm getting old, though I'm not even 30 yet, but I've never grasped HSL like I have RGB and RGBA. I come from a background of toying with OpenGL and game programming, so it became habitual as that was the required structure ~10 years ago.
With openGL, DirectX, and other real-time rendering I believe sRGB or linear gamma are preferred because there are library and possibly hardware primitives that can be taken advantage of.
Outside of that I feel we should be notating color in terms of the L* a* b* colors
Web browsers also seem to be using RGB for storing colors internally. You can specify colors in HSL, but retrieved values are only in RGB. E.g. if you write "hsl(100,0%,0%)" in your CSS file then the color will be represented as #000000 in DOM/CSSOM. This is especially annoying when you are trying to implement color picker because information about hue is lost if saturation or lightness are low.
