You'd expect to see this even more if the (mostly time) cost of making a small fix AND contributing it is very low. Compiled code hurts you a little, big unwieldy build systems hurt more, difficult contributor environments hurt most of all. Few people want to wait (more than a few seconds) for a compilation step. Scarcely any want to put hours into just learning how to make a running binary. Nobody at all wants to spend their spare time doing somebody else's stupid paperwork.
One thing a big project can do is make it easier to contribute at the fringes. Are there parts of the project which are easier to build, or don't in fact need compilation at all? Expose them to the power user and encourage improvements to be contributed back to the project. Lots of people write a Gimp Script-Fu that does something useful to them (and perhaps useful to others) without even owning a C compiler let alone knowing how to use it
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