What I don't get is why these companies are in all the rush to replace people with AI tools. Stuff is changing so fast that capital investment right now will just need to be reworked on after a few years when things settle down a little.

And that is not even considering how much it costs to run AI right now at scale AND retraining people to use the new tools AND possible disruption in existing workflows.

If I was running a large org I would actively try to slow down AI adoption in most areas until there are clear established solutions.

It's because these are public companies. Public companies are not in the business of developing good products and selling them to customers and having a sustainable long-term vision, they are in the business of selling their stock. Right now, thanks to a very effective marketing campaign driven by people who are invested in AI companies, the stock market wants to see stories about employees being replaced with AI, so that's what these companies are selling.