I only have experience of macOS and Windows.
I am not sure why you have made this statement and hope that I haven't mislead you.
I have been working with computers a long time and was an early adopter/builder of small micro processor based computers. Us enthusiasts called them micro computers or 'micros' for short. My NASCOM that I still have has around 3000 soldered joints all of which have to be perfect. Theses micros didn't even have an operating system then along came CP/M. These were considered big boys toys and were expensive by todays standards but we could play games! Then out-of-the-blue came Lotus 123 that ran under CP/M. The business world pounced on this as now they had proper word processor, spreadsheet and graphic presentation applications that didn't need an expensive mainframe nor dedicated expensive kit such as Wang and could run them on an inexpensive micro. DOS followed soon and I remember using an NCR micro that had a switch on the front panel so that you could boot from either a DOS or CP/M diskette.
IBM noticed this and bought to market their own micro computer and with a stroke of marketing genius named it the IBM Personal Computer that soon became IBM PC. There were many others also working with micros such as DEC, HP, Apple etc etc. All these micros/PCs used 8 bit processors from different manufacturers. Then along came the first 16 bit processors and the Universities were crying out for a proper O/S for this new architecture.
Meanwhile AT&T was working to modernise from the mechanical Strowger telephone system to a digital based one and the result was a box that employed a 16 bit processor and their own operating system called UNIX. AT&T let the Universities use UNIX for free but held on to its copywrite.
Why have I written all this? Well our home computers be it Apple or A N Other are all microcomputers and if we stick to Intel/AMD processors can run the same code. From the two historical operating systems above DOS became MSDOS/Windows and from UNIX we got LINUX and Apple OS X/macOS. Thats why an Apple built computer is just another PC. Some were dire whilst others were really good solid machines like the Mini and Macbook Air and I can run Windows and LInux/UNIX as well as macOS on them. The opposite is also true for PCs built by A N Other. As with Apple some are dire and others really good solid performers.
So the three major O/S developed along different paths - Apple concentrated on audio visual, Microsoft developed for the business/office environment and Linux was and still is for the academic community.
I have condensed and over simplified this history as you could write a book on it so I stand by for the usual nitpicking but I hope it gives insight into why to me our small computers are all PCs.
Oh and the T series Lenovos? The T series was designed and built by IBM in its factories for its own IBM staff so is a tough/rugged and reliable machine. IBM then moved out and sold the business to Lemovo.
DV
