Ron, as observant as you are I would be surprised if you miss much of anything. That is a compliment by the way.
I am with you through, there are not many good sites out there anymore dealing with marketing. Even the development sites are drying up as more and more people move to those out-of-the-box systems.
Thank goodness for businesses and the need for security. That is what keeps my business booming. The best thing that ever happened to professional web developers was the introduction of WordPress and Joomla. Over the last year I have had more businesses approach me to move to secure custom systems that were on those platforms than I have in the 5 previous years combined.
Getting back to his question though, I think a big part of the forum design limitations has to do with the amount of content that must be displayed on the landing page above the fold. It is really difficult to display that much information, because after all that is what captures your audience, in a way other than a tabulator format.
And I agree with EGW, most developers are not artsy fartsy, I can confirm that hands down. I have the same issue myself and my staff has the same limitations. We can write code for most anything, but one it comes to making it look nice, color balance, etc. I hire a graphics designer to lay everything out, then we code around it.
I think has to do with the sides of the brain that are used for the different tasks. Programmers are very analytic and artsy people are very conceptual. I think God might have said the two brains shall meet ...... of course, that is a joke.