I don't think you can define "technical" in a universal manner. New riders will see almost every trail as being "technical", and to more seasoned riders will see most of those same trails as just another trail. For example, to me "sudden ups and downs, twisty sections, sand pits, the occasional root" just sounds like a normal trail, but I accept your defining it as "technical" because I don't know much about your skill-level or experience. "Technical" is just too subjective of a term to have every rider of all skill-levels agree on just one definition.