Funny you should criticize the postfix community for this. Did you see what they are responding to?
Source control (SCM/VCS) is a MUST have. It's unbelievable that people just work with tarballs without proper source control. It doesn't matter which you use, but it must be available. Sending patches over email is what people did last century...
I think the "kids these days" comment was in reference to someone waltzing in, contributing nothing, and demanding everything immediately be done their way.