It's about maintaining a clean codebase. If a maintainer believes that a proposal is genuinely the wrong way to achieve a goal, it is counterproductive to acce

It's about maintaining a clean codebase. If a maintainer believes that a proposal is genuinely the wrong way to achieve a goal, it is counterproductive to accept it. This happens all the time in the Linux kernel for instance, where one or more further iterations are required to get something accepted. It's just juvenile to stamp ones feet because some upstream disagrees with a particular approach. You argue the technical merits, and then you live with their decision by going your own way or revamping your submission. It's hard to imagine open source working any other way.