Complexity in itself is not an interesting measure but it's a proxy for an interesting measure: time and cost to build/maintain.
A more complicated program that is built and maintained with LLM assistance is cheaper and faster to build and fix than even a less complicated program built without. It's even the same without LLMs: once React achieved critical density and "won" the JS framework wars, building React apps became cheaper and faster even than building plain HTML/JS apps.
I strongly disagree. Incidental complexity is the enemy good emergent properties of a system; security, auditability, stability, testability, maintainability...
A more complicated program that is built and maintained with LLM assistance is cheaper and faster to build and fix than even a less complicated program built without. It's even the same without LLMs: once React achieved critical density and "won" the JS framework wars, building React apps became cheaper and faster even than building plain HTML/JS apps.