As the author of the question Why do US presidents play golf? I might be regarded as biased.
It is not obvious who benefits by enforcing a strict rule about relevance - a quick look suggests that this site has about 15 questions per day, so relevant questions are hardly being lost in a flood of poor questions.
Regarding my golf question, it has attracted five up votes and two answers, which have taken significant effort from contributors (who presumably thought it an interesting question) and one of which references four publications, including two that I think contain significant political news ("Business Insider" and "The Atlantic").
This answer mentioned that President Lyndon Johnson had used his golf playing to advance his political objectives, and so clearly this has a political relevance.
I purposely asked the question avoiding prompting possible political reasons why US presidents play golf (at least, more publicly than UK politicians). One possible such explanation would be that a golf-playing image makes a president more electable.
The amount of time presidents (Bush, Obama and Trump, at least) spend on the golf course has (I believe) been widely discussed. For presidents, at least, the space between private and political life is very narrow.