You do not have to do everything a reviewer ask, but you should reponse to each point they ask. If you really don't want to do a plot, don't and justify it to the reviewer. In these circumstances, if there is something you really don't want to do, I would make sure I address all the other points the reviewer raised, to show that you have carfull considered what they said, even if you disagree with somethings. (Like additional citations you don't think are relavent but the referee does).

On the other hand a good plot goes along way to explaing what you are doing, espically in astrophysics. If you make a plot I could then put that plot in my talks (advertising your work for free) if it made sense to what I do. If all you have is equations then I'm not going to put anything about your work in my talks.

You do not have to do everything a reviewer asks, but you should respond to each point they ask. If you really don't want to do a plot, don't do it and justify it to the reviewer. In these circumstances, if there is something you really don't want to do, I would make sure I address all the other points the reviewer raised, to show that you have carefully considered what they said, even if you disagree with something. (Like additional citations you don't think are relavent but the referee does).

On the other hand a good plot goes a long way to explaing what you are doing, especially in astrophysics. If you make a plot I could then put that plot in my talks (advertising your work for free) if it made sense to what I do. If all you have is equations then I'm not going to put anything about your work in my talks.