Automatic surfacing of Sharepoint sites in applications
It would be very nice if Sharepoint subsites and site collections a user have permissions for on the tenant is automatically added in Excel, Word for Windows, Android etc without the user having to manually add them. Just like subsites behave in Office Mobile for Android. In Excel for mobile you have to add subsites and new site collections by manually entering the URL. Very user unfriendly and a guranteed call to IT-support.
Andy Tuke commented
In Word / Excel etc, you can't simply browse into the document libraries of group sites that you are a member of. The round about way of having to copy the url out of the browser, drop the /forms/allitems.aspx suffix off the end and then paste it into the open dialog is ridiculous
Please make it easy to pin document libraries into the desktop apps so the average user can find their files in SharePoint