> seem to me to be constructive and respectful "Constructive" is interestingly subjective. The higher the raise the bar, the more likely it is to be controvers

> seem to me to be constructive and respectful "Constructive" is interestingly subjective. The higher the raise the bar, the more likely it is to be controversial because e.g. you require posters to share and build on the same assumed knowledge. You are welcomed to challenge assumed knowledge from a position of expertise but not from a position of ignorance. I give "I disagree" downvotes on topics I am very familiar with and the poster is simply insufficiently experienced to be broadcasting their bogus opinions however polite they are. I can surely imagine even more inexperienced posters would see that poster as constructive and helpful but its not the case.