As someone who uses AI coding agents daily, the thing that still surprises me is how much faster I can iterate on the "problem space" vs the "solution space." I can try 5 different approaches to a problem in the time it used to take to implement one. The code itself is cheap now, but the expensive part—figuring out what to build—hasn't changed. If anything, being able to quickly test ideas makes it more important to be clear on what you're actually trying to solve.