FWIW, duckduckgo has a feature that allows you to jump to any site from your search bar.
Searching for '!so Hello, world' will pull up a stackoverflow search for 'Hello, world', and searching for '!w Hello, World' will pull up the relevant Wikipedia page.
When I'm searching for something code related, I always want stackoverflow to be at the top.
Most of the time, when I do a google search, I have a destination in mind, and am simply using google to get there. The only time that I really want diversity is when I'm searching for something in a completely new subject matter. This happens relatively rarely.