An example of a purchase I made recently is this $15 bimetal heat break: https://www.amazon.com/dp/B0C5VSK1V8 it's basically a part that allows you to 3D print at higher temperatures. To figure out that this was the right product I wanted, it took a couple minutes of research, looking at diagrams, searching recent reddit and youtube posts, etc.
If I would have asked an LLM, it would have told me to buy an all-metal hotend that costs $70 or more, based on outdated advice.
I don't trust LLMs for out of the box thinking because they have no idea what is going on in the real world. They are fine for discussing general aspects of well-documented and often-discussed things like taxes, cooking, or gardening.
I would say the exact same for Google.
What isn't SEO'd to hell is crowded out by half a page of paid search ads.
I'm not a typical consumer though. I don't think I've ever bought anything via an ad.
The only search ads I click are the ones where Google FOMO-extorted the brand into buying ads for their own trademark. (That shit ought to be illegal given the monopoly levels of search capture Google has. Everyone having to buy up search clicks for their own brands and company names is comical. A protection racket.)