The problem is that's not discoverable though. The toggle on google.com would be nice but most people probably arent searching that way.
This is the exact use-case, and it makes a lot of sense. The hard part for Google is identifying when someone wants search and when someone wants an AI response. It's somewhat identifiable by the input but of course thats extremely messy to determine systematically.
I recently bought a Bambu 3d printer after Reddit/HN drew my attention to them and AI mode has been really useful for me to learn about my new printer and troubleshoot things. There is so much information and I don't have time to read everything. I just want to ask a targeted question and have something summarize the literature's answers for it.
It will be a sad day when Google inevitably enshittifies it, but for now I'm happy for them to subsidize my expensive LLM queries.
But if they're letting me using AI for free without logging in and I just need a dumb AI slop answer, then I'm more than happy to burn their tokens instead of my own. Any serious work goes to a different LLM provider. The switching cost for moving to a different LLM provider in the future is practically zero.