I agree here - but I also think it really depends on the bass and the equipment. My Modulus is such a bright instrument already - when I put stainless rounds on it I had the very same problem. It was brutally bright. Nickel on that bass, for sure. But I can get away with stainless on my P-bass because it’s so dark to begin with.
Absolutely. Flats have already shaved off the high high end, so as time goes on, you don’t have that same experience of losing all that chimey high end like you do on rounds.