It's not about testing only. All future features have to be vetted against the design decisions made in those contributions. Maybe the primary maintainer, after

It's not about testing only. All future features have to be vetted against the design decisions made in those contributions. Maybe the primary maintainer, after accepting a contribution, has to mind consistency with a feature, they now have to make Tain they don't care about from the start and is in the way for a feature they'd like. Taking contributions has long-term cost.