There are popular UX issue:

1. User install postcss-cli, but forgot to install postcss
2. postcss-cli takes old postcss 6 or postcss 7 from the deep dependencies
3. User have true is not a PostCSS plugin without a good explanation

@RyanZim we can solve this problem by checking PostCSS version in postcss-cli:

if (parseInt(postcss().version) < 8) {
  throw new Error('Please install postcss or update it')
}