Sharing responsibilities are healthy, rather than the old 'man and dog' of previous generations, where "you don't touch that, because I'm the Captain"! Still sadly alive in some cockpits/airlines!
That goes both ways. On the other side of the coin I have seen accusing looks by copilots who glare at you because I as captain dared to touch a switch which was in
their area of responsibility Sadly alive in some cockpits/airlines!