Copied from #2844 (comment)

I feel like the parser option is a bit of a leaky abstraction. It would be nice if the option was called language or something like that so you can pass --language scss and we'd figure out which parser to use.

Unfortunately changing this would obviously be an API breaking change.

Posted by @lydell

I agree that the parser option is strange and could be better.

Btw, the postcss parts of your table should look more like this:

parser	language
postcss (actually postcss-less+postcss-scss+postcss-media-query-parser+postcss-selector-parser+postcss-values-parser)	css
postcss-scss (actually like css but minus postcss-less)	scss
postcss-less (actually like css but minus postcss-scss)	less

We could introduce this option and deprecate the parser option.