I think Will was surprised at the third type (mechanical as you called it). I prefer to think of what you call mechanical as price-driven automated. I usually lump automated trading into one of two categories.
Indicator 
-based (like MegaDroid, FAP T etc) which relies on varies indicators and price-driven (all automated grid trading systems) which do not use indicators for it's primary logic.
Getting back to Strider, so if the price moves in a single direction without a retracement long enough, Strider will keep opening positions in the opposite direction Martingaling as it goes. Yuck..that's scary

What is the probability of the account blowing? Obviously, you must think it is very low.
Rick