Re: Do what Microsoft used to do...
Windows 8 and Windows Phone UI were excellent, well thought designs for a tablet and phone UI - much better than Windows 10. A very good improvement over the very outdated and limited 'Program Manager' UI still used by most phones and tablets.
They should have never, never been used on a desktop or server system which require a totally different UI.
Windows 10 Mail application is another example of a very bad design that trying to be modern became unusable. The same approach was used for the Outlook.com UI, which is now impractical and very slow.