Not sure about this (maybe Mike can chime in), but I believe all the 
categorization is from the users themselves, as the forum software asks you 
to put your post in a category when you ask it. 
Also, I wasn't implying that the auto tips alone would be a reason to move, 
the slowness of Google Groups and the terrible formatting of posts 
(especially code) are much more important in my opinion. I still think the 
auto tips could help for the case of the "I rewrote this Matlab/R/Python 
code in Julia, why is it so slow?" questions.

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