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Quasar
It tells me whether a person i'm interacting with is a regular and also an indication as to their credibilityJoin date and post count is possible but not desirable. I don't see how that is useful.
I try to respond to people whose join dates precede mine.
Basically it better to interact with people that have made an investment of their time here ie mods , heavy hitters and regulars.
As it is now i can't tell the difference between yourself and somebody that joined yesterday. Only way is if i remember your handle and that isn't practical.
These two metrics have been readily visible since the day forums began, this would be the first forum i've come across that is entertaining the idea of doing away with it.
Simple as that.