The saying I remember from a checkie:
"When you're with an FO that knows what their doing & understands the aircraft/systems & can fly well it makes the skippers job easier, when you find one who knows how to lie, cheat & steal, then you know you've got a good one"
By the last bit he meant cause I was always chasing clearances for direct to or track shortening, poetic license for ETI when asked & things were busy
, cancel speed restrictions etc.