should `extract_css` be true?

In `config/webpacker.yml` the `extract_css` option is currently false unless in production, but this seems to break importing predefined styles.

Should it be true?

In the meantime if you are trying to include styles from an npm module (i.e. bootstrap) do the following:

1. create `app/javascript/packs/styles.js` file and import the style sheets you want.
2. add `<%= style_sheet_pack_tag 'styles' %>` to your layout files.
3. set `extract_css: true` in `config/webpacker.yml`

Currently trying to find an answer to why this is all necessary here: https://stackoverflow.com/questions/59009216/how-to-get-webpacker-to-load-css-if-extract-css-is-false