Screwdriver -> power drill
Hand-coding -> llms/agents
Sometimes the only thing that can fit into a tricky spot is a screwdriver. The power drill didn't make screwdrivers obsolete, it just made them less necessary day-to-day.
Same thing here. LLMs are power tools, but sometimes, the only thing that can fit into a "tricky spot" with code/systems is knowing how to do it by hand.