in the past I have learned that most of them wouldn't understand configuration management, unit or regression testing if it crawled out and bit them on the arse. Cue web developer and, most likely, some nincompoop with a smattering of Java, C#, Python
Clearly I don't count as a "web developer" then.
Seems to me that to build a web site you need "artists", whom you don't let anywhere near the software, "designers", whom you don't let anywhere near the software, and "software engineers", whom you do. I'm one of them (mostly working outside the area of web sites). So I can do an excellent job on making the software work properly, but wouldn't dream of doing any of the arty work, because I'd be crap at it.