Because not all vet students do post-doc stuff (right? you could go directly into practice, if I remember right),
Yes, we can practice after our 4 years, assuming we pass national and state boards of course. However, some of us are admitted greedy bastards and gluttons for punishment, so we go on to residency for those nice higher salaries 😉 Just kidding of course. Well, half-kidding.
it seems like ECs could be a useful way to network with people who have similar interests, get an idea of what your options are, etc. But I wouldn't think that would translate into being a competitive candidate, necessarily. It seems to me that research, especially being published and/or in an area that is interesting to the program you are interested in, could be helpful.
That is basically what I was thinking. ECs in general (and by this I mean clubs, etc...even professional organizations to some extent) are very overrated. Networking? Yes. Getting you a job? Heck no! Research/publication (at least in vet med) is very helpful if you want to go into research or epidemiology. But if you wanted to become, say, a board certified surgeon, or something, then doing research wouldn't help you diddly-squat.
But man...these people who think they are the bread and butter of the school by holding dinky little offices in 6 different clubs....what are we, in high school? No one cares if you're class president, sorry. No one cares if you are AAEP's fundraiser, or Alpha Psi secretary. But if you had actual experience --- i.e. for example in med school, a surgery residency, you spent a summer working as a surgery assistant, or in vetmed, for equine medicine, you worked as an orthopedic tech....I can see that being much, MUCH more influential.