This AI agent thing has been discussed a lot, and often people exaggerate it like a device with full consciousness that can replace human tasks in making decisions and doing analysis. but I'm not so sure that it can be like that, because the difference between machines and humans lies in many aspects, and I don't think this AI agent can reach the point of being like a human. maybe it can do analysis and provide a summary of something, but when deciding a decision, it might be a little difficult for the AI agent, because sometimes a decision does not come from mathematical calculations, but also a feeling and intuition that the AI agent does not have.
Well since the existence of AI technology and it's distinctive feature in multitasking and so on people tend to replace humans efforts with it and thus it's gradually taking over the duties of man. But it's a matter of time and I'm sure humans efforts would still be the best cause like you said they are machines and they will fade someday and need good maintenance and when this happens human efforts will be needed which is inevitable, it's just the fact that so many prominent companies needs things to be done in a jiffy this is why they bring in this Al machines to carry on the task but human efforts can't be compared to AI assistant or agents.