Disagree a bit on the Google example. > For one thing, repeating the entire search query in bold isn't necessary. The user already knows what they searched for

Disagree a bit on the Google example. > For one thing, repeating the entire search query in bold isn't necessary. The user already knows what they searched for. Echoing the input is useless. But if the program is interpreting the input somehow (like there are keywords or commands allowed), then showing the user what the program understood could be critical to finding the problem.