Add a "slot" functionality to components

[Jeroen2]

@Brace

There is a ton of use cases for slots. Basically, every container should be a slot. Every modal or a dialog box we design, should just be that: modal or a dialog box, and they should be free of content in terms of logic. You add content to it, because they shouldn’t be concerned with content, just the layout structure and design.

(emphasis is mine)

I was just thinking about this “extensible” possibility, too. Like being able to truly create modular components in atomic design systems. Like a segmented control component which accommodates N amount of segments: