Take this question for example Good workout split for absolute beginner with Planet Fitness equipment? (skinny want to build muscle whole-body)
I started thinking out an answer for it, then realised that there's actually a lot to address in the question, and it's pretty much all opinion based.
We tend to close questions that are opinion based as they don't have solid answers, which got me thinking that many of the routine based questions (recommend a routine, critique my routine, etc, etc) are opinion based.
I don't like bodybuilding style training splits, so I'll always lean towards more strength based stuff, yet bro splits do seem to work for some people, so my answer to a question like this is based on my opinion.
Should questions like this be closed as opinion based as there's no single good answer?
(personally, I think no, because a person has come here seeking help, and they could get some very good advice, even though it is "opinion based")