I'll have to watch it later, if I can still mentally function (trying to configure both AutoPLANT and a new version of ProSteel - those who know will understand...).
LISP has got a few holes and is nowhere near as powerful or elegant as managed .NET or ObjectARX, but by the same token its ease of use makes it much better for those of us on the front lines. Upshot is, AutoDesk REALLY needs an internal LISP champion to handle this stuff. Probably not a professional programmer, either, as they will more than likely miss the benefits for the faults. While such a person may consider working with the bigger, badder tools "easy" they are fully dedicated to learning all the ins, outs, and gotchas needed to make something work. Down here at the pointy end of the stick, that level of specialization means NOT having all the peripheral knowledge needed for day-to-day operations: talking materials with the engineers, structural shapes and sizes with the civil folks, cable trays with the electrical designers, configuring all the applications needed for each, etc.