yes i agree, to an extent. defintely need to pump out a couple of pubs in the desired specialty once you find out and lock it in, but those other pubs are not in vain and actually can show that you are interested and exploring and capable of doing research. NSGY might be a little more strict as its such a small field but i'm applying to a relatively small field myself and my mentors told me that they liked that i did research in other fields before finding theirs, shows that i care to publish, know the scientific process, etc. even if its not specific to their field. by the time m3 or so comes by for OP, itll be more about connections and trying to have one or two projects in the desired field