I do 80% of my work either on a samsung note 4, hp stream 7 (windows tablet), or a 1st generation ipad mini. Heavy lifting is done on a surface pro 2 and before that a 1st generation MacBook air. I'm hoping more app builders catch on to windows. Windows 8 tablets would have been fine if they had good app support.
Office 365, salesforce, gotomeeting, excel and PowerPoint and i am to go on any platform. I just need a bluetooth headset that can handle lots of talk time.
I can say in my industry, tech sales, is pretty much capable of moving to 100% tablets. The next generation of windows tablets running the latest Intel atom processors (or equivalent) will be plenty of horse power.
I wonder how well Cortana is going to work or if it is just a gimmick.
I'd have to say, based on the apps you've listed, the comment about Atom processors, and your choice of machines for "heavy lifting", that your overall computer usage is very lightweight compared to.... just about everyone I know. Granted, I work in the Architectural & Construction industry, using programs like Revit, AutoCAD and Bluebeam. In that environment, I have a dedicated PC with a fast hybrid drive running 16GB of RAM on Windows 7, though probably 50% of my work is done on a MacBookPro.....running Windows 7 in Parallel