I think that's an unfounded and problematic stance. Front-ends almost always involve working with data. It is increasingly common for front-ends to have filter

I think that's an unfounded and problematic stance. Front-ends almost always involve working with data. It is increasingly common for front-ends to have filters, searching, sorting, etc... of that data as well. Doing that efficiently is key to ensuring a fast, responsive UI. Wrangling with divs and CSS may take a disproportionately large amount of your time but that doesn't mean it's the most important skill to look for, nor does it mean the CS questions are somehow irrelevant to the work.