Don't exaggerate. Windows 11 is not totally unsupported for older systems. This would mean it cannot be installed at all, that there would be no workaround. Our old computers work perfectly with Windows 11, exactly the same, if not better with Windows 10. Unsupported here means Microsoft has the right to deny assistance. Not that it doesn't run at all. As for why, for the same reason one installs Windows 11 on an officially supported system. We want the latest and newest operating system, plus we like the new look. It is nicer than the flat lame interface of Windows 10.
I have taken your post and numbered the various comments for clarity.
1. Windows 11 is not totally unsupported for older systems.
As far as Microsoft is concerned, Windows 11 is totally unsupported for older systems that do not pass the PC Health Check for Windows 11. Run into trouble with Windows 11 on a system that doesn't pass the PC Health Check, ask Microsoft for help and see what they tell you.
2. This would mean it cannot be installed at all, that there would be no workaround.
Not true. There are legacy OSes that can still be installed which are totally unsupported by Microsoft. And yeah, Windows 11 can be installed on a computer that doesn't pass the PC Health Check; however, it is totally unsupported by Microsoft. (refer to #1 above).
3. Our old computers work perfectly with Windows 11, exactly the same, if not better with Windows 10.
This is a matter of opinion. Whether Windows 11 will run on a computer that doesn't pass the PC Health Check is a tossup. It may or may not install. It may or may not work properly. Read through the threads here and you will find numerous occasions where the OP cannot install or control Windows 11 on his/her legacy hardware.
4. Unsupported here means Microsoft has the right to deny assistance. Not that it doesn't run at all.
Not true. Unsupported here means Microsoft
will deny assistance without the security requirements listed in the PC Health Check.
5. As for why, for the same reason one installs Windows 11 on an officially supported system.
Could be, but not necessarily. I have a laptop that isn't up to par for Windows 11, so it will never see that OS. If none of my computers would support Windows 11, I would stay with Windows 10 and save my pennies for a system that would.
6. We want the latest and newest operating system, plus we like the new look. It is nicer than the flat lame interface of Windows 10.
Yep, I want the latest and greatest, but that's not to say I will like it when I get it. I and a few gazillion others absolutely hated Windows 8 and didn't actually much care for Windows 8.1 when Microsoft finally started to listen to us.
Not everyone likes the new look of Windows 11 (I am one of those). I like the Windows 10 interface much better than Windows 11. The user interface of Windows 11 is a minor distraction, though, when compared to the latest security measures Microsoft has included. I am testing Windows 11 because of the enhanced security.
Please don't put me and others into the category of "everyone loves it because you say so". Especially since you advocate so adamantly that we should defy common sense and install Windows 11 on a system that doesn't pass Microsoft's PC Health Check.
Lastly, no one should encourage anyone less savvy to put Windows 11 onto a system that doesn't pass the PC Health Check. Even if asked, this is not something any reputable Computer Repair Service would do. If he/she installs Windows 11 on inadequate and less secure hardware, It speaks volumes to me.