Some questions about updating and idea sketch

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http://forum.xda-developers.com – 1) why is it suggested to do a factory reset after updating? I understand it allows better performance but is it proven and If yes what are the benefits /performance boosts? 2) the new idea sketch isn't working for me. After pressing it in s note, nothing appears. Anybody facing the same problem? Thanks! Sent from my GT-N8000 using xda app-developers app (HowTos)