Rav Moshe not only “disagreed” with personally observant jews who took jobs in conservative temples, but once spoke about how they’re destroying yiddishkeit, and asked “farvoos? Farvoos?’ and yelled “fahr gelt!”
Conservative temples paid a ton of money; it was very difficult to make a living as a pulpit rabbi in those days.
Rabbi Avraham talansky, who was in torah vodaas in the times of rav shlomo heiman, told me that he knew a lot of talmidim who became conservative rabbis, and that none of them were anything special in learning.