I don't mean to be blunt but it is clear that you have no real understanding of the capabilities and advantages of iOS.
You say - "also use my iPad Mini4 for short travels and bed side reading / surfing, but for extensive use of Excel, Word and composing emails with screen shots and editing PDF documents with inserts or using multiple scalable windows on the screen to exchange information between them, I would never even dream of using an IOS device. Multitasking on IOS is a joke."
Saying this proves my response because these tasks are very basic iOS tasks and are easily performed on iPad, in fact I would say they are done more intuitively and effortlessly using iPad, just the very loading time to opening the apps required to do this is quicker on iPad Pro.
I agree with M.Gustave & Mr_Killjoy you don't understand iOS or the purpose Apple built iPad Pro for!
Call me an old school if you wish, however I consider myself a highly technical person. I have more PCs Macs and iPads than you can shake a stick at them at my disposal and use all of them all the time.
Okay, please teach me about how to do some of the things I do on my Mac and/or PC.
Sometimes I need to open two or three windows side by side and cut a portion of a screen or copy a portion of an information from one screen to another. Examples are like accessing banks online, where I need to have a recent document in front of me while I enter a pertinent information from that document to the online banking screen. IOS limits me to two screens and they are not entirely scalable. Either a small vertical window or a 50/50 split screen. No room for the third screen if you need it. How do you cut a portion of the screen like you do on a Mac with "cmd-shift-4" and paste it into your document? Perhaps not entirely impossible but cumbersome indeed. I find highlighting to select a portion I want to select a little inconsistent and difficult most of the time with IOS and using fingers.
How do you accommodate different user accounts on IOS, which is a built in feature on almost any OS, be it Windows, Linux or Mac? And don't tell me I can live without it please.
I test many programs using different versions of OSX. Easiest way to do it by booting it from an external drive without a fear of affecting your main work environment. I test different OSs for development and training purposes using virtualization. How do you do that on IOS?
I import video from various sources like Video Tapes, DVD, 8mm tapes, old archival film using a movie projector, convert them to various digital formats to store and distribute. How do you do that on an iPad? Also, is there an IOS version of HandBrake?
I do forensic data analysis on disk images and restore data. I really don't know how to do that with an iPad.
I scan old pictures using a high resolution scanner and store them on my archival RAID storage. I don't know hot to interface my scanner with an iPad.
I assist people with their PC / Mac problems remotely using screen share. While I can access remote computers with an iPad using VLC and such, mouse interface is not all that comfortable compared to TeamViewer or BTMM. Also, I don't know if it's possible to access (screen share) an iPad remotely.
What is the equivalent of the Xcode? How do you write programs for IOS using IOS?
The list is longer than this but these are the first ones I could come up with.
I'm not even going to ask if there is an IOS version of the OSX Server.
I'd be grateful if you could enlighten me how to perform these tasks with an iPad so that I can ditch my Macs and PCs and be like you and M.Gustave.