Reviews are written to get anyone acquainted with a particular field of research. Any sensible researcher would first write a review before starting their field of research. This must be done, so that the particular candidate (researcher) has an idea of the work that has already been done in the field and what more could be done or undone.

I say undone, because there are some fields of research, for example, research on CAR T cell therapy, it can be used to study response of cells in petri-dishes, but it CANNOT be translated into bedside. It cannot be a bench to bedside story for technologies like CAR T cell therapy. For some others, similar to Alexander Fleming's discovery of penicillin, small tests first on the skin and then may be little further and that too, not life-long, penicillin too has its time frame ( a dose of ...mg for 7 days or at the most for 2 weeks), may be possible. Even penicillin's usage might have started due to situations like a war, where a soldier has had his leg amputated due to unforeseen circumstances, and required a miracle, and it was not used just because we learnt something new (a way to abuse Pharmaceuticals into discovering cannibalistic medicines for fun?). It is cannibalistic behaviour, when I see young children have the mentality of "it is survival of the fittest", may be even just to kill each other with a slingshot, forget about advanced technology. If we together don't protect science, by being strict with technologies like CAR T cell therapy and the innumerable anti-cancer drugs in the market, we are not destroying anyone else, but ourselves.

Thus, going back to how writing a review widens our knowledge and thus our views on the various possibilities of continuing research. Some researchers, may have gained expertise in gamma delta T cells, now everything and anything they can ever think of, is ONLY gamma and delta T cells. OMG! there is more than just gamma and delta T cells, within our human immune cells. Just because, the researcher worked on gamma delta T cells, any and every disease, THEY MUST link it to gamma and delta T cells, and that is WHERE research goes WRONG. This is because, the researcher needs to look outside their field of knowledge, the disease may have nothing to do with gamma delta T cells at all and yet they have published their research, that too in NATURE, SCIENCE etc.

Writing reviews, allows us to think with a wholesome view of the subject/topic, without any prejudice.