Earlier quoted context omitted.
There is an event horizon that one passes at a certain time in their career in which they come to realize that the two disciplines are indistinguishable. Both are expression of creation, a person that does not see the creative value of one has not reached the pinnacle of the other.
Nicely said. I am a developer and a designer, and I used to tell people it wasn't worth learning HTML or CSS since it's taken care of in many CMSes and plugins. But now I've come to realize that people who have little working knowledge of HTML/CSS are unable to even conceive of using the Web to its full potential.
Or any app to be honest. If you want to make a nice application, that path is not in the slightest bit open to you.
For simple websites I agree and say the same thing, otherwise, no.