I'm an open source dev who doesn't take PRs, I just build a body of work that's hopefully consistent and leans a useful direction. Are you sure being a maintainer means coordinating a community? If your only role is facilitating the community then you ATA to reject their changes, but if you embody a direction you're trying to maintain the project to represent, then you have a free hand to accept or reject based on whether the goals are being served. In some ways as a maintainer it's your job to have these goals and to communicate them.

I'm reminded of Zig, where a stated goal is to encourage human programmers to get involved so they learn more about coding… as compared with 'get involved to make Zig itself more fully developed at its more abstract goals'. If a primary purpose is to get human minds coding, that rules out the whole class of 'encourage human minds to prompt machines to do the coding instead'. Zig is not trying to teach people to be managers, and that's both legitimate and charming :)