In reply to Anne McCarthy.
Since you were playing around with duotone, I’d be curious to have your thoughts on this issue I opened in light of Paal’s feedback on the exploration: https://github.com/WordPress/gutenberg/issues/38556
The popover not persisting between actions has been the biggest annoyance with it. I think I've just learned to live with it, so it's been something I've largely ignored. I use top-toolbar mode, so the popover covering the image has been a non-issue for me.
For framing, can you say more about the intent there over using the border options? I want to be sure I understand the distinction.
Sure. Here's a clearer example from a custom frame block style: Notice the image wrapper has some padding and a white background, creating a sort of "border" of its own (sort of like a matte in a photo frame). Then, there's the actual black border around the outside. For users to create this, they would need to have options on the wrapper for border, background, and padding. Compare the above to just a bordered image: For users to create this, they would need to have an option on the element for a border. And, I'm not even getting into box-shadow and outline possibilities yet. :) Right now, I'd be happy to get some extra stuff in to cut back on variations of custom block styles.