Not entirely fair, considering: (1) these are marked as issues that need to be fixed, and (2) many of them are related to IE implementing the CSS-grid W3C draft

Not entirely fair, considering: (1) these are marked as issues that need to be fixed, and (2) many of them are related to IE implementing the CSS-grid W3C draft, vs. coming up with their own proprietary technologies. (Your comment was modified since I hit reply, but I think my point still stands, especially that it isn't strictly MS-extensions, but actual standard drafts)