I am aware of Okun's campaign to eliminate the term "realtivistic mass". I am not sure I am 100% on board with this, because the concept of "relativistic mass"

I am aware of Okun's campaign to eliminate the term "realtivistic mass". I am not sure I am 100% on board with this, because the concept of "relativistic mass" is intuitive and practically useful (used by engineers working on particle accelerators, for ex.). For instance, if a quantity of photons is put into reflective mirror box, when you put it into the scale, the measured weight will increase by E/c^2 (both before and after the photons are absorbed).