I think the benefit is unclear but it's almost certainly not limited to good will. There's lots of developers who are working on products targeting Windows tod

I think the benefit is unclear but it's almost certainly not limited to good will. There's lots of developers who are working on products targeting Windows today (for momentum, their customer's requirements, etc). Those devs encounter Windows bugs and generally workaround them. But if instead they could patch them and/or provide patches upstream, it would be a huge benefit to them and likely some benefit to Microsoft as well.