I'll essentially just repeat what I talked with the other moderators: responding to the points in Travis's post: https://math.meta.stackexchange.com/a/30915/59234, in order: 1) I don't think vector-analysis is broad as a tag. "gradient", on the other hand, would be broad. I am not sure what tagging as "gradient" would entice other than the question containing the gradient of something. For instance, the mathematical level is unclear, and the context can vary wildly.
Should someone talking about the gradient flow for their studies in Morse theory use that tag? The gradient of a function on a…