I think you can still have users decide which projects get funding and have the system/organization/smart contract/etc automatically distribute funds to the libraries those projects depend on. 80% to the project, 20% to the libraries, etc.
If we let devs decide which projects get funding, they’re just going to always pick their own project. Since that doesn’t align with what users want, users won’t want to donate. If you want users to donate, you need to let them have some say in what their projects their donations go to.