I have no reason to believe heavier instruments sound better and would never tell anyone to suck it up and play something uncomfortable or injurious. I do seem to gravitate toward boat anchors, but not because I enjoy their heaviness. They just tend to have features I want, and I can handle wearing them for as long and as often as I do. I understand why I hear a lot of players on here shunning heavy instruments.
That said, I almost never hear anyone talk about anything feeling too light; but I find I don’t like the feel of exceptionally light instruments, even setting aside balance issues. I move around constantly while performing and I don’t want the thing bouncing or just feeling insignificant. I have a couple featherweights that I tolerate, again because they have the right features for their roles, but I really prefer something that feels substantial. Anyone else?