Well I disagree, first that the previous question got anywhere (as we ended up with a new tag and dealt with the others) and second that this tag should be changed to only meanings with synonyms.
It's not that I am against synonyms but that I am for simplicity. meanings-definitions is quite clear, we don't really need to make separate tags to distinguish a word difference that in the end won't make a difference in the understanding of the question for it to be answered. A meaning and a definition are often closely related, and if it is the case that they are not, the answer will explain it. EL&U works differently, and I think it fairly complicated compared to how SL&U has been working for this time.
As you said, they are close enough to justify being categorized in a single tag. In the end this question is only of shortening the tag name. IMHO, I don't see the benefit or why should we bother. Instead of messing with synonyms etc..