The following two questions seem like good questions to me tagged career-development
Research Experience for Undergraduates: Summer Programs (that accept non-American applicants)
Pure mathematics in our society
They are both specific to mathematics and admit factual answers that are generally applicable.
There should be some good questions that happen to be tagged advice, but I feel this tag is so vague and broad that "under the [...] tag" just is not applicable.
Likewise, the tag soft-question is in my opinion too broad to talk in a meaningful way about questions "under the [...] tag". In some sense it is an "anti-tag;" historically, a main reason for it to exist is so that users that so wish can block vague and non-mathematical questions (at least it was like this on MO and a lot of the early tagging conventions here where imported from there).