I think the most stand out example of the weird childish behaviour of magi is on page 103 of the core rules "However, the assistant is announcing to the Order that he considers the primary researcher to be his superior." Seriously. Why?
What kind of adult does not understand a simple quid-pro-quo? Or what is the problem of the order, which has 50 different technique/form combos to accept that yes, in a certain magi's specialty they are superior?
A simple scenario. You have two magi with different specialties working on a signature spell to cap their career. Say a level 60 ritual. They've both got their lab totals to 65, so it's 12 seasons to compete the spell research. If they assist each other, it's 4 season each (Assuming +10 Magic Theory + Int for older magi is on the low side, however, it's the bonus I went with). 4 seasons for their spell, 4 seasons assisting, they both have 4 extra seasons.
Please don't argue the numbers. If this is easy in your sage, make the example a level 80 spell, or whatever it needs to take a lot of seasons. The concept, not the numbers, is the point.
A magi committing to giving up a season to help a magi, and that magi agrees to help later, seems sensible, and the mature thing to do.
Would the average magi give up a season to get a higher cord level on a familiar? I'd think so. Two magi agreeing to assist each other with a familiar binding seems logical.
A magi who can just make the charged item so it has one charge, however with assistance the charged item has 3. Tripling a seasons effort at the sacrifice of a season seems worth it.
Same with a magical weapon needing high penetration. Every point of penetration matters, and sacrificing a season for those extra points seems sensible.
I'm sure others can think of examples where they'd easily give up a season, or more, for the lab bonus a magi can give.
That's a starting point regarding the man-baby behaviour of magi. The reluctance to copy books, with the "But that's mine", again seems a bit petulant and childish, and also against Bonisagus's vision.
I know, humans are flawed. Many of us are selfish, however, there's also a bunch of altruists, and even self-absorbed pragmatists would see the virtue of assisting magi regularly. Why are the order mostly man-babies?
Apologies to the females in the order. Man-babies is a common term, however, I'm also happy to include the women-babies in my sweeping disdain of the Order's general attitudes to sharing.