This functionality wouldn't change the swatches palette it, but would allow users to drag a swatch to the artboard and drop it. You could tile several to create a tonal family or brand color set.

Being able to scale them larger, arrange them, reformat the grid, turn the white gap off in between colors would improve color adjustment and comparing hues side by side. They'd function like the existing swatches panel in that you could have a shape or stroke selected and apply the color by clicking the swatch on the artboard.

This would help in color exploration and creating effective color themes. Save common color usage in your workspace set up, export out as a group, share via Libraries, copy and paste artboard swatches to another file etc.

We need a way to quickly transfer appearance from one object to another.

For now there are several ways to do it.

1. Grab the Eyedropper tool. Go to tool’s options. Set both Appearance check-marks. Select the art you want to apply appearance to and click the one you want to copy appearance from with the tool (or vice versa with a proper modifier held).
   This one requires me to go to the options before to set these check-marks and go there after to turn them off, because I don’t need these by default.




2. Save a graphic style from the object you need to copy it and apply it to the target one.
   This requires to save a temporary style and delete it after. Still, is the fastest method for now.




3. Open Layers panel, click Locate button (which still doesn’t have a hotkey but can be recorded in an action, at least), grab the appearance filled circle marker and try to drag it over with the Alt held the target one, but not the object on the canvas, but the item in the same panel... the one you can’t locate now, because you have to locate both items. This is quite simple when you have, say, two object on your canvas, but is tough when your art has hundreds of objects.




4. Copy an object you want to grab your style from and command Paste Appearance with the target object selected. The most easiest one.... wait... we don’t have it in Illustrator.

Because there is none.
And we can’t make it via scripting, because scripts can’t create or copy graphic styles, which we could have used to emulate method 2 automatically. There are 2 requests about it:
https://illustrator.uservoice.com/forums/908050-illustrator-desktop-sdk-scripting-issues/suggestions/39131704-access-all-variables-necessary-for-each-item-s-app
https://illustrator.uservoice.com/forums/908050-illustrator-desktop-sdk-scripting-issues/suggestions/35703022-graphicstyle-aspect

So I’d like to see all of these implemented.

Adobe doesn't take colorblindness into account when coloring the handles in Illustrator. I'm not talking about layer colors -- I don't care one whit about layer colors. I'm talking about the associated colors of the handles for the layer, which is the same color as the layer. You can keep layers colors multivariant if you wish, but when working within a document, I simply cannot see the handles when the layer color is against a color in the document that I cannot distinguish between. I've tried resizing the handles, but that does not always make a difference. My only workaround is to "throw layers away" until I can find one that is properly distinguishable.

I am working on a 2017 iMac pro with an 18 core Intel Xeon W processor, 128 GB of 2666 MHz DDR4 memory and a Radeon Pro Vega 64 GPU (16 GB memory). I just (November 5, 2019) updated to AI 2020 and everything is significantly slower than the last version of AI 2019 (yes, GPU enhancement settings are on). I purchased AI CS because it had the GPU enhancement and it was 64-bit allowing me to work with the rather large vector images produced during my data analysis from spacecraft. However, this slow down is like going back to AI CS 5. What changed/went wrong in the new AI 2020 that caused such a drastic change in performance? AI 2019 was fast and great but something broke in 2020 making everything (saving, dynamic manipulations, etc.) much slower.