I agree with you that tips doesn't seem very useful. I'm a layman when it comes to photography, but looking at the questions in the tag right now, there's nothing particularly common about their subjects. This suggests to me that as a tag tips isn't helpful when it comes to categorizing these questions.
Far as its tag wiki goes,
Questions which ask for guidance born out of personal experience. Good tip questions are confined in scope to a specific photography-related topic.
The first sentence applies to all questions as well. The best answers come from personal experience and are backed by facts and references. The second sentence seems to just define what makes a good question for the entire site.
I personally don't think a tips tag is serving a useful purpose, but as an alternative a better tag wiki and careful review of questions that attract this tag to avoid it being a "catch all" location for questions would help.
What are the tips for shooting sunset/protests/etc. simply downvoting and moving on doesn't help.