I guess HTML/CSS is something that can be done by a non programming designer, so if your team is large enough to have separate back-end devs , front-end devs an

I guess HTML/CSS is something that can be done by a non programming designer, so if your team is large enough to have separate back-end devs , front-end devs and designers it's more important for the developer to be able to manipulate CSS than design it from scratch.