I would imagine that managing a team of AI-agents is totally different from managing a team of people.
It's about knowing the capabilities of people, what can they do, what do they excel at and where they need support.
The exact same applies to LLMs, each of them have their own very distinctive styles as well as strengths and weaknesses.
Just like human engineers, LLMs can't just be plugged in to the same role as the previous one with the same instructions and expect the same results.
Thus: soft skills.
“Soft skills” in management just means figuring out how to get what you want from the people you have available to you. In that respect those skills translate to using an LLM.
For instance, how do you motivate people to work long hours, put in extra effort, feel proud of their work? How would you do that with AI?