I think the analogy is a bit inaccurate here when people are talking about automation.

Microwaves do one thing, but they do it reliably. Microwaves didn't affect the culinary industry because cooking is far more than just heating food, and many tasks are very difficult to automate. LLMs are more general-purpose - the average Joe is now relying on them as a source of truth, advice and mental work across the board. However, LLMs can't be guaranteed to always be reliable, it's all probabilistic. The threat of automation here is in taking away a lot of the less important or less complex work. Low impact + high precision (microwave) vs. high impact + low precision (AI)