the exhaustion pattern i've noticed is specific: it's not writing the code that's hard, it's integration. the model produces clean isolated functions fast. the part that takes mental energy is knowing where those functions should live, what they'll break when they change, and why that architectural decision was made 3 months ago. that context isn't in the code -- it's in your head.

so the bottleneck shifts. before: generating code is slow, integration is easy (you built it). after: generating code is instant, integration requires the same mental load as before because the codebase complexity didn't decrease -- it just grew faster.