it's quicker to write, though. and many of these class names are the same in bootstrap, so I've been seeing stuff like 'p-0 m-1' in frontend projects for decades.

another huge benefit these days is with the styling living alongside the markup, it is very easy to use chatGPT or other AI tools to copy/paste and have changes made, etc. it is much less work with one file vs multiple. you can give the context super easily and take the results very quickly.