I don't understand this kind of criticism.
I get into my car. The accelerator doesn't have "Press here to move more quickly" written on it. The brake doesn't have "Press here to stop". The horn doesn't have "Press me if the big light outside is green but the aluminium box with wheels in front of you is stationary"
If you lower your standards to silly degrees, people will mill around that lower standard. I've seen tertiary students reach for the calculator to find out what 3 x 0.2 is, simply because they can get away with not putting in any effort. Naives that need more help should get specialised help to get them over the hump - normal users shouldn't have to deal with UX chaff just on the off chance some random person might choose one day to pick up a computer and try to learn it without asking anyone for any help.
No-one learns to drive all by themselves. Or cook. Or read. Or dress themselves. Would we really want pants to come with a permanently attached set of instructions on how to wear them, just in case someone who always wore skirts might one day try pants on a whim?
A UI should be constructed for a userbase, and the "have never used a computer before, ever, but am trying right now and will only do this on my own" demographic for search engines is miniscule. One wonders how such a person can get to the search engine in the first place - it's certainly not like Duck Duck Go is the default homepage for any browser.