Ok, you may be right. But my point is that "best toaster" doesn't mean anything per se; do you want a fast toaster? Durable? Low energy consumption? Elegant? Large capacity?

There are many characteristics to any device and the "best" one depends on personal preferences. What's the "best car" for example? Does that even mean anything?

I don't think a generalist search engine should be used for shopping. You don't need Google to read reviews on Amazon and form your own opinion, again, depending on your own preferences.

People use Google as an oracle and then complain when that fails. But Google is a search engine. It's not the Pope.