[Jach]

Geometric Algebra is really cool and powerful and good, why isn't it used more? The best things aren't often the most popular ones. (And in a practical business setting, the best is often the enemy of the good enough as well as the better. You get the circular cause problem because Lisp isn't mainstream, so most programmers will not know it, and will be faced with the decision to learn it or go with what they know.)