chiply's series of posts on the site about VOMPECCCC is a really interesting look into:

  - A fantastic UI pattern and it's wide applicability
  - Building in a modular way
  - How emacs provides a fantastic substrate for packages to fit together

(VOMPECCC => Vertico, Orderless, Marginalia, Prescient, Embark, Consult, Corfu, Cape)

I love this. (I probably won't use it as these days I'm a Doom Emacs user and don't want to monkey around with my setup too much, but the concept is great.)

The guy's whole website is also worth clicking around. A huge amount of effort.