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You make some very good points. Let me try to address those.

The way I see it, HSL will be useful for situations like, you have some given color as background to an element. Now you want to have a slightly darker shade of the same color, the obvious choice for this currently would be to use a color picker. You can certainly use a color picker. Now what if you want another color again which is a slight variation of first color or even what if you want to choose a color completely complement to original color? These are the cases where I would see me reaching for HSL. Now if i have a predefined design, and also a predefined color palette for my website, this may not be that useful(I would still use HSL, even in this case). But if you are building your own site by hand, choosing your own colors, then HSL will come a lot handy saving a lot of time.