Deprecate Kingdom in favor of Tailwind?

[bjuppa]

With Tailwind CSS finally (and excellently) supporting @apply with "variants", the use case for Kingdom CSS over Tailwind is becoming very narrow!

Actually the only major things left from Kingdom that Tailwind doesn't handle out of the box are vertical rhythm for every HTML element (level 3) and baseline-shift (level 4). But if needed in one of my projects I'd probably use Tailwind as a base and then customise line-heights and positions to achieve the same effects on a per-component level.

• The default spacing that Kingdom level 2 provides can be handled per component using https://tailwindcss.com/docs/space and for large scale with https://tailwindcss.com/docs/typography-plugin
• I'm sure there's a way to create a children:-like-variant in Tailwind, if not it's probably quite easy to write a plugin, and https://bjuppa.github.io/kingdom/modules/extenders/ is mostly used for spacing anyway and Tailwind already does that part https://tailwindcss.com/docs/space
• Responsive locks can be handled much simpler using CSS min() & max() in the post-IE era, and personally I certainly don't intend to ever launch anything new supporting IE 😄