I don't get this sentiment. Just as the maintainer is allowed to do whatever they want with their project, random people on the internet can also warn other peo

I don't get this sentiment. Just as the maintainer is allowed to do whatever they want with their project, random people on the internet can also warn other people about downsides of said project. Absolutely nothing GP said implied that they felt entitled to a feature. It is useful information for potential users to know how the project works and if it might not fit them well. There's no contract or agreement between the maintainer and users. Users are free to talk about the project. As long as they don't demand anything I don't see the issue at all.