I have heard the other side, which is that many one-line patches require significant time from maintainers because it's often "hand-holding" to get them to where they need to be and often they are not really correct or have some other issues. But even with that I think the case of "maintainer abandoned this patch" or "maintainer is actively looking for new contributors but does not make it easy to get your foot in the door" is the more common one.