the purpose of Zen teaching isn't to acquire new conceptual baggage, but to eliminate it

if we keep struggling with the problem, even though we cannot expect to achieve anything, we build within ourselves ever more complex models, ways of seeing.

Huh?

Anyway, people only run on treadmills because they don't have a lot of places they really need to go to on foot. People only lift weights in gyms because there isn't a lot of heavy stuff that needs lifting. But someone who seeks to sharpen the intellect will never run out of real, important practice problems. Insight, unlike transportation and lifting, has not yet been mechanized or obsoleted. So why settle for fake problems?