BS. I was hired as a web-dev to do front-end HTML/CSS/Javascript at the ripe age of 18... and that was to work on one of the most prestigious websites on the Internet, the BBC News Website.
I already had been doing front-end stuff for several years. I wasn't any less able to perform the job than the CS graduate peers who started in the same role the same time as me.
11 years later, I've not done badly for someone with no formal CS training.
I agree with you, which is why I didn't say "should be required", I said "should help out quite a lot". I was responding more to the original posts implication (which I may have mis-understood) that front-end engineering isn't a demanding discipline.
I found stuff I learned in my CS degree helped me understand closures in JavaScript for example, and the compilers course I did has helped out with a bunch of things.
I already had been doing front-end stuff for several years. I wasn't any less able to perform the job than the CS graduate peers who started in the same role the same time as me.
11 years later, I've not done badly for someone with no formal CS training.