A lot of it has to do with people going into EM for the wrong reasons. I've seen interns come in with no skills, but great enthusiasm for the profession and they do well. Likewise I've seen people with prior residencies (like FP or IM) start EM thinking that they'll have more family time, have a better salary, or just an easier schedule. These people who clearly have no interest often crash and burn.
i agree people who are really interested EM do generally better, just like any field, if you put my in GYN i'd be a slacker, not enthusiastic, and pretty much a pain to everyone around me!
But there are also folk that pretty much hate every day but are still good, but its less often that happens.
I think people leave residencies for a lot of reasons and its not like they just leave without thinking about it, I mean its a pretty big decision in their life and even though a year of anything (besides ob/gyn) is never a waste...you still have to really not like EM to not continue for 2 more years and be done with it.
another point brought up was the multitasking...its really different than in med school, i did 3 rotations and on all of them was never pressured to see more patients, most of it was just see what you can, if you need to spend 2 hours doing that lac, its ok...all things like that. Even now not necessarily pressured, but any resident will start thinking/projecting themselves a few years down the road as an attending and think 'will i be able to handle it' like the person they are working with. Some of these attendings are supervising like 3-4 residents, some pas, seeing some patients by themselve, signing off on ekgs, dealing with abusive patients...and you know when youre an attending you're gonna have to be able to manage the 'whole ED' or whateve part is your responsiblity. And you can't spend 2 hours doing a lac, and in general have to be very good at time management...
ok i think thats enough of nothing