[Ligrev]

That assumes you have the means, the knowledge, and the time, to go through a build step.

What you find to be clean code might go the opposite way for someone (i.e. why would I use scss if utils are all I need?).

You might work with large scale apps where BEM may make more sense. You might work on a site builder where utils might be better. You might be creating splash pages for marketing purposes where going for element selectors may be enough.