OK, I’ll take your downvotes. A bit of self aggrandisement before I start - I have been professionally involved with IT and technology since 1971; have written shrink-wrap, not for profit, business and scientific software running on a variety of OSs; been an enterprise architect; run consulting and technical businesses, and have chartered status in one of the basic sciences.
I am retired, but help out as a volunteer supporting and teaching retirees “computing”. Most of the retirees that I see don’t want, or can’t cope with, a traditional computer; an iPad does almost all of what they want. Some other users who may find that an iPad is all the computing that they need might include artists, photographers, some multimedia workers, writers, IT server and website support staff, researchers and managers.
Recently what I have found surprising is the number of small businesses that are run on a mobile phone, often with a tablet too; and the number of younger people who (even on a normal computer) run in a “modal screen” environment where they are mostly doing something in a full screen, with a minimal use of cut & paste.
I do have an iPad Pro, along with an iPhone X, a 2011 vintage iMac, and a couple of small BSD/*NIX servers (as toys). The iMac runs High Sierra, and occasionally Windows and Linux in VMs, but I probably spend most of my time reading the paper on it. I volunteer as a technical assessor for our national accreditation authority, so it is still useful for looking at very large documents and spreadsheets. The iMac is not supported for Mojave, and if it dies I might consider replacing it with a large screen and a Mac Mini; but I have some difficulty justifying this as I have found that I can do much of what I want on the iPad in a split screen with a Bluetooth keyboard, so echoing the iPad to a large screen with an HDMI cable might work OK *for me*. iPads are not aimed at *most* of El Reg’s readership.