> None of them provides the same seamless integration between documentation, code changes, change requests, project management, build pipeline, in-house deployment and quite relevant in enterprise context, customization.

Indeed. Often less is more. Your comment may inadvertently be making my point for me. :)

For example, a hyperlink (implied is fine, added in a view is fine) between a commit message and a ticket in my view, is possibly the perfect level of integration.

Integration does not have to (nor should it) mean poor performance or usability.