Thanks, glad it resonated! Totally agree on the maintenance win with CSS.

If I had to pick one most underrated pick, I'd go with :has(). It quietly turns CSS into something with actual conditional logic — "style this element based on what's inside it" was pure JavaScript territory for years, and now it's one selector. Things like styling a form field's label when its input is invalid, or changing a card's layout based on whether it contains an image, used to mean a classList toggle and a bit of state-tracking. Now it's just a selector rule sitting quietly in your stylesheet doing its job.