I'm not saying using BEM is a bad thing. Not at all, I'm using it too and like how it plays with Sass/scss.

e.g. I do like how Sass makes it easier to write BEM-like code similar to the below:

// style.scss .btn { ... &--success { ... . } }

// style.css .btn {...} .btn-success {...}

But when abusing Sass nesting and choosing a weak naming convention, the resulted CSS selectors can go wild. Here's an example: https://github.com/tootsuite/mastodon/blob/995f8b389a66ab76e...