nishtdayngeshfet: You quote the two geonim (R”Moshe and R’Yaakov) who may have considered themselves Roshei Yeshiva -and I am not even sure if they did. (I am not even sure if you can consider R”yyakov zz’l a Possek). You are right that I wrote a definite statement,that “Roshei yeshiva are not Poskim”. Allow me to amend that to- the vast majority of actual shaalos uteshuvos are from Rabbonim of kehillos. I mentioned some of them, I can mention many more, while you will have difficulty finding many illustrious Roshei Yeshiva that were Poskim.
I am not sure what fantasy world I live in. I back up what I say.