> Why would I ask annoying questions when I can identify, reproduce, pinpoint the bug, locate it in code, and fix it?

Because if the bug is sufficiently simple that an outsider with zero context to fix, there's a non-zero chance that the maintainers know about it and have a reason why it hasn't been addressed yet

i.e. the bug fix may have backwards-compatibility implications for other users which you aren't aware of. Or the maintainers may be bandwidth-limited, and reviewing your PR is an additional drain on that bandwidth that takes away from fixing larger issues