Re: "The concept is broadly similar to Microsoft's Continuum for Windows 10 Mobile..."
> Not really, there's no MS Office suite for Linux
This is about 'mobile'. There is MS Office for Android, which is said to be better than the one for Windows Phone 8.x.
There are many Office suites for Android and/or Linux including WPS, LibreOffice, Google Office. If you require MS Office then use whatever works for you. Others don't need it or want it.