YOU CAN'T HILL CLIMB YOUR WAY TO "GOOD EXPERIENCE"

Summary from the TLDR Design newsletter

Coding agents excel when success can be evaluated with deterministic tests, but good user experience cannot be reduced to a metric that can simply be optimized upward. Interfaces depend on nonlinear relationships between hierarchy, wording, context, attention, expectations, and human limitations, meaning hundreds of individually reasonable changes may still produce something confusing. AI can test whether an interface technically works, but its ability to read everything and perceive a whole page at once makes it a poor substitute for the distracted, imperfect humans who actually need to use it.