Good content and good SEO are not mutually exclusive, they are both equally important. My site always had good content on it. When I installed a SEO optimization plug-in for a competing forum software about 4 years ago, my traffic quadrupled, as did my Google Adsense earnings. The content was there, but the clearly having the site better optimized for SEO was also EXTREMELY important. The good SEO wouldn't have helped if the content was there and vice-versa.
I applaud and give Invision Power a standing ovation for their efforts to make SEO on their software as good as possible!