You can slide the banner down. Still annoying af
You also get SponsorBlock and Return YouTube Dislike right in the app (+ many other ui and functionality modifications)
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The Internet Explorer system stuff is still there, the difference is that when it launches as a normal browser, it automatically opens Edge instead of IE. (iirc)
Sorry if off-topic. You can try it here: https://macos9.app (or 8 if you replace the 9 with 8)