Why...? Web design and Web development are very strongly connected, and getting your html and css to work properly is very different form the "design-oriented apps and techniques" that is the focus of this forum.
Now if you want to make a nice design on a web site header (or even a whole web site) and focus only on the design process and how you make those graphic elements in Illustrator, Photoshop, Freehand or whatever, then make the thread in the Design forum and if you want to make it work on a webpage come over on the Web forum.
Again, think of ways to make this forum better and lay off the Web forum, which is actually working pretty well. Seriously.
Web design and development are strongly connected, but I don't consider HTML/CSS to be development. It's part of design. Job headings for designers will require advanced knowledge of XHTML/CSS and sometimes also AJAX, among other things. Development is really PHP/MySQL, Ruby, etc and we don't get that many of those questions. And like I said, if we split it, it would be sparse. But I'm not in flavor of splitting it so much as organisinig it better with design, which is, of couse, closely related to design in general, and yet different.
Despite the description for the design forum, I see many "what font...", and "how to..." questions and lots about graphic programs, esp photoshop and the whole cs suite. This forum needs a lot of organizational work. I'd suggest at least a Photoshop forum or something. But there are many more articulate suggestions above. The description itself probably also needs work.
I agree with you there, the web forum is working pretty well. At the very least, however, I want it moved up closer to the design forum in the listings (I skip over photo and a/v each time).
Anyway, I find it somewhat tedious to have to create 2 separate threads all aiming to achieve the same goal.
My main reason for moving them closer (and possibly including one in the other) is to gather all design reviews and portfolio reviews in one place. Where does one post a review without double posting? Also, some users only view one forum regularly and not both (including me, a month ago). Right now, there's no way to get both audiences (despite a large overlap) without double posting.
Example:
https://forums.macrumors.com/threads/327896/
The audience that responded to this thread is limited mostly to a few players.
I think you're a bit too resistant to change. If you read some of the suggestions, you'll notice that some don't want to change the web design and development forum in the sense of breaking it up or merging it, but rather just moving it, all for the sake of improving it really.
I also think that you might be surprised in terms of the benefits
your the forum could reap.
It's not your forum, rather MR's and therefore everyone's.