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This is a bug tracker. What you are describing is much closer to a project management tool, just to make the difference clear.

Those should be tightly integrated, if not the same tool.

It depends on who manages the project. In an open-source project, those will likely also be engineering types, not non-technical managers.

It's hard to make a product that's all things to all people, and it's wise to make a product that has a well-understood, if more narrow, audience.

To some people, engineers without project management doesn't make any sense.