I doubt that's the case. MS knew IE was broken and outdated but so many people rely on its implementation at that state, they couldn't move it forward and they

I doubt that's the case. MS knew IE was broken and outdated but so many people rely on its implementation at that state, they couldn't move it forward and they had to reset before they lost every share in the browser market. They certainly didn't want Edge to look as broken when people had, if(browserType === 'IE') doIEWorkAround() else doNormalThings() So I understand their disguise.