From what I see, it highlights a difference in design cultures between the organizations. GitHub has an amazing Product Design organization who have really evolved the product from the early days to what it is today. When I look at GitLab's UI, I get a feeling that it's a UI that feels designed by an engineer without much thought about these design principles you mentioned. It would take a huge overhaul of their design team, culture, and code for GitLab to bring their UI up to par.
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