> ...many of the most common complaints about LLM coding (most notably hallucination) are essentially solved problems if you're using agents

Inconsistency and crap code quality aren't solved yet, and these make the agent workflow worse because the human only gets to nudge the AI in the right direction very late in the game. The alternative, interactive, non-agentic workflows allow for more AI-hand-holding early, and better code quality, IMO.

Agents are fine if no human is going to work on the (sub)system going forward, and you only care about the shiny exterior without opening the hood to witness the horrors within.