Alright so either it's a useful piece of information and then it's useful to scum, or it's not and then it's not useful to anyone. There is no sweet spot in the middle where it somehow becomes useful to town.
Look, town can either play as a bunch of individuals keeping everything as close to the vest as possible or as a team pooling information and insights in order to make better decisions as a group. Doing the latter surely gives scum more information, but it also allows town to, you know, play a team game as a team game, work together, learn from each other, and generally improve the quality of their guesses. Whether the opportunity for town collaboration outweighs the opportunities for scum sabotage is, sort of, the whole game.
Ironically, what happens here is exactly opposite than in my post that you quoted: There absolutely is a sweet spot.
Sharing nothing is clearly bad for town. Sharing everything is better... but not very good either. If it were the best way to play, we should have a massclaim at the start of every game. You present this as a binary, but it's not.
But to say that you should never share information that might be useful to scum is to say that you should never share information, which is clearly absurd.
And maybe that's the reason noone has ever said it, including me. When you go back and actually read my posts, you will find that what I said was you should never share information
that isn't useful to town. That is my assessment of MiX's Galzria read. There is absolutely a time when sharing townreads is good; like when there's a wagon on your townread or you are doing PoE. This is not that time.
And then there's a bunch of information that is somewhat useful to town, and somewhat useful to scum. I would say that for these you should weigh whether the benefit is bigger than the downside, and obviously different people may come to different conclusions. But it is my impression that most people around f.ds don't bother doing that evaluation at all.