The excerpt of support says
A request for assistance with one of the site's features
Since SE network is about Q&A, by "assistance" I understand that a one-time intervention by other person is required, b/c privileges, not by providing knowledge in the form of a post.
When a user make a post, a question, asking for a description or for clarification on a SE site feature, IMHO, the post (question) is a regular question, there should not be be required a special tag.
Burninate the support tag? (unanswered)
This question is about the use of the support tag on Stack Oveflow, but the core idea is the same.
Seems like people come to >>> Stack Exchange meta sites <<< for support, no need to tag your question with support.
nquestions tagged support. Only one-time support would >>> should <<< be valid, IMHO, in Meta
What's the point of the Support tag if your question just ends up being closed as 'too localized'? - This question is about an issue that the OP has with his/her browser, but the title beginning could be appropriate for this post: "What's the point of the support tag".