Beaverlicious
you are totally right, and don't get me wrong i'm totally pro the vibe "make thing happen no matter how" and "learning by your mistakes" but, if you are alone/solo-dev you know well your limitations, you know well what will work for you and what parts you need to improve, the only one you have to talk is yourself, you can ask others for opinions but the last word is yours.
the thing gets tricky when teams are formed:
-what a team mate means to you?
-your goals are the same as your team mates?
-all your team REALLY like this project idea to stick with it for months with no cash involved?
-did they have the same philosophy as you with game design?
-and what if you don't want to work with then anymore but want to keep working in the project yourself alone?
-and if some of your team mates don't want to work with YOU anymore, but want to keep working in the project alone?
game jams are a brilliant way to test this company side of things; and getting your feet wet is not a bad thing, just have a little consideration before the jump