Open the color picker with a single click
In Photoshop and XD the color pickers open with a single click. I can't think of any reason why we need to double click in illustrator
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Mohammed Amjed Khan Abro commented
Fill and Stroke should bring its Color Picker Dialog with a Single Click on it, which one is active we would just click and bring its Dialog.
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There is one reason behind having a double-click instead of a single click in Illustrator, I think. Unlike in Photoshop, a single click on fill/stroke selector can do another operation — activate one of them. In Photoshop it’s not a thing at all — it’s a foreground/background widget, these can only swap.
So in one case a single click will do one thing (open the Color Picker), and another thing (activate), which is not consistent and sucks more than having a double-click, which now works always.
That’s why probably it doesn’t get many voices.