At the residency program where I did my training, the psychiatry residents that started with the medical residents were on par with them.
The psychiatry residents that started rotation months down the road were behind, and as a result, they were expected to do less because they couldn't be counted on.
When no one knows how to do a procedure, everyone is taught, including the psychiatry resident who knows just as much as the IM residents.
When all the IM residents know how to do it, and the psychiatry resident doesn't know, the senior resident will just make the ones that know how to do it do it.
Normally, for the IM residents, if they are behind, they get their ass kicked. The senior residents will make them learn things they are behind on, or they will get kicked out if the program has some self-respect. The psychiatry residents are an exception because the senior IM residents will go figure it's not their field, so let them pass even if they are not up to par.
While IMHO the above phenomenon is not a good thing, I know plenty of lazier psychiatry residents that embraced not having to do as much.
And these same psychiatry residents were the same ones months and years down the road beeping me, while they were in the ER, not knowing what to do with a patient that was medically cleared but they doubted the validity of the clearance. The better trained psychiatry residents would've been able to handle it on their own.
While I was a chief resident, as much as I would've liked to kick the butts of these lazier residents, the attendings were far worse. Some of the attendings didn't know that a BP of 129/86 was not hypertension. So I was trapped in a situation where I felt doing so would've been just too much of an ironic hypocrisy. Besides the program I was in didn't want to be getting on the backs of the lazier residents. That was a good thing if you actually wanted to learn on your own because you could do so at a more relaxed pace without someone making you do it, but if you blew, you could get away with it.