Reb E, no one’s dismissing him. Being rov of a hospital is wonderful. Writing teshuvos is also great. Having government rabbinical jobs is neither good or bad, it’s just a parnosa, it doesn’t show gadlus. He was a legitimate posek and i use his sefer myself(not that he needs my haskama).
But in the big picture, he was one of hundreds of influential rabbonim in the 20th century. Rav Moshe was one of…3 or 4, who built up klal yisroel after the war, and was on the level of an early acharon in learning. He’s up there with the chazon ish, brisker rov, rav aharon kotler, and maybe one or two others.