Illustrator forgets which color mode is set in the Color palette (and Gradient)
Color panel always starts with RGB values. That's useless or very hard to use 99% of the time. So first thing for me is to set my Color panel to HSB and it stays like that for that session, but after a restart it's RGB again. Always!
Gradient panel is even worse because it forgets instantly.
Standard gradient's pop up color select is a Grayscale slider. I've never in my life needed that - not to mention HSB has the same with the value slider. But this bothers me less than what follows:
If I change Grayscale to HSB and do anything (click away, select same object again) it goes to what? RGB. Always.
Please make this consistent and make AI remember my color mode choice permanently (until purposeful change)
I don't dare to ask for HSB as the default program-wise, but to be honest that would be the best.

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Filip commented
I agree with @Anonymous.
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Anonymous commented
I work with RGB web-based color libraries predominantly, as do my users. This should be a configuration option in personal preferences, not a general change.
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Mark Nicoll commented
Indeed. It's good to know it's not just me being driven nuts by this.
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Any commented
Yes! Enough with this reset to RGB sliders insanity. And make the #HEX box common, why do we always and forever have to change to RGB to get it? It's infuriating.
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Jay Lender commented
I'd like a preference to to set a default color picker for ALL PURPOSES, regardless of what the document's color mode may be. In my case, I'd ALWAYS be choosing colors with the HSB sliders.
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Mark Gould commented
I would also like there to be a way to make color model selection more universal - such as mentioned, if you have chosen HSB in the color picker that then becomes the default for new colors and color menus that appear. Also would love to see the ability to toggle between color picker and color swatches everywhere - the only place I believe it currently is found implemented that way is in the gradient color stops. Most of the time I'll work with HSB, and would love it not to have to select HSB each time or place the color swatch menu is accessed, especially in the Appearances panel. I will also post this in feature requests.