Not sure how it would be difficult? Instead of a colour, the colour becomes a class. The class is then used when you select the colour instead of the actual colour. Then when you update the colour in the saved colour palette it updates the class so all of the objects using that saved colour/class would all be updated. The same as if using a text editor. I would have a class “red” say for red text, then use that for all text alI wanted red. Simple. Then say I wanted to change that red to a different shade or orange or blue or whatever, its just a matter of changing the class and all elements with that class will be updated.
The class system used by webflow is useful but also an absolute pain in the arse in equal measures. Also with a text editor I could search for the #ref and do it that way too. I mean if webflow opened up its code to be search and edited then the software would be perfect. But I can’t see that happening any time soon. However a simple, badly needed, updating of its colour palette is far more likely and sounds simple to me. There is more you could do too, like re-organising saved colours into groups and so on, as the palettes are all jumbled up if not pre-planned… But lets start with the basics… 