[ivanhoe]

Problem with pure CSS is that when you work in teams very quickly you start getting a lot of redundancy. People reinvent already existing styles, copy/paste code all around with just minor differences, color/padding/margins inconsistencies are introduced, you get dead classes that no one dares to delete, etc. The solution is usually to have one person define all the core styles for all components, and then you mandate the rest of team to re-use them as much as possible - which basically boils down to the same thing these frameworks provide, just someone else did a lot of that initial work for you. And if you don't want to use all those utility classes directly in the html, you can use components and @apply to group them into more semantic classes. Still you get the benefits of having ready made utility styles, and also of using the system that a lot of people is familiar with and can quickly onboard the project.