Drupal is the open source content management system (CMS) that probably has the largest community behind it and thus is the most powerful. If we hadn't built the Site Management Console (SMC), Drupal is the platform that we would likely go to for most of our projects.
But we did build the SMC and we continue to use the SMC over Drupal, so you might ask why would we dedicate a page to Drupal development on our site? Just because our development team isn't as proficient on Drupal as they are on the SMC doesn't mean we cannot work with you or the platform. We have Drupal clients and we are able to service them just as we do any other CMS.
Some food for thought if you are contemplating a Drupal website:
As mentioned in Does CMS Still Matter, it is important to build your custom website on a CMS but which one you choose shouldn't be "deal breaker" material. If you already have a Drupal website, love the platform, and are looking for a redesign, then it's understandable to want to stay with something familiar. If you're not binded to Drupal then don't hesitate to try something new either.