Leadership is also a very human thing. I think most people would balk at the idea of being led by an LLM.

One of the main functions of leaders (should be) is to assume responsibility for decisions and outcomes. A computer cant do that.

And finally why should someone in power choose to replace themselves?

Someone in power doesn’t get to choose - the board of directors do. Who’s job is to act in the best interest of shareholders.

Firms tend to follow peers in an industry - once one blinks the rest follow.