https://www.google.com/search?q=dcss+branch+order
https://duckduckgo.com/?q=dcss+branch+order
This isn't a case where I _know_ I only want 2017 results, and so I do the syntax to filter it down automatically. I want all results, but I want to be aware of the timeline of whatever I'm going to click.
But to take the thought further: I can understand when a date isn't important. Say some documentation for a specific programming related thing. You'll probably learn to use !clojuredocs or something.
What about outside that? Those searches I can't quite describe without thinking, but my example above sort of works nicely because that game in particular has changed a bunch (and will continue to) over time and you do care about the date of a forum post or whatever.
For all I know, the answer is "that's when you use !g".