Currently we have 3 questions which are tagged with the "dplyr" tag. All three of them have zero votes. In my opinion questions related to this tag and this R library are about data wrangling in R. Therefore I think they are off-topic as they are primarily about coding and not about statistics or data visualisation itself. Can we delete the "dplyr" tag?
I don't see why not. You make good points.
The two questions by tomclark seem to be on topic -- "What is the best way to test if the number of Males in group 1 is significantly greater than group 2, which is 0?" is clearly a statistical question (I am astonished to think that anyone would maintain that's off topic here. In need of clarification, perhaps, but definitely within our scope).
Unfortunately they're duplicates of each other, so one should be deleted or the two should be merged. Unfortunately, one has been extensively edited -- so it has more information -- while the other has the longer answers; I'll have to think about how to tidy that up.
While I definitely disagree with deleting both of those, the other one does look off topic and should be closed (which I just did).
Either way, the dplyr tag doesn't seem to be needed; it's not relevant to the statistical question being asked. (whuber's suggestion of keeping the tag but warning that a question using it may be off topic is an interesting proposal, and defnitely worth considering)