Surface level is where you can find the most day to day value. Just today I've used it to get advice about putting up a treehouse, rough price ranges and differences between fridges, common fridge widths, adding second accounts to microG, command flags to identify slow tests, poe support for my wifi router, differences in laser measurement devices, french translation, medication storage, different types of olive, and drafting 3 emails in another language. All of this would have taken me way longer without these tools, I'm confident it gave good results because I know that the information exists and is common.