It is like there are 2 camps / faith in this matter. I am a on / off guy and you are on all the time.
You make some interest points about being on all the time and there are valid points for those that turn off their hardware like the ones listed for the cell phone. It is a matter of personal choice.
I been turning my PC’s off for the past 35 years and know of no harm being done to them.
Just because I keep my computers powered on 24/7 doesn’t mean that I never reboot them, in fact, I reboot my primary laptop at least once per day so I can switch to my Garuda installation. My desktop, and primary laptop PCs dual-boot Windows 11 with Garuda Linux, the KDE-Lite flavor, and my older laptop PC dual-boots Windows 10 with Garuda GNU/Linux, KDE-Lite flavor. I’ve recently learned that I can upgrade my older laptop to Windows 11 by mounting the Windows 11 ISO image and executing the setup.exe file, since it has a TPM version 2.0, the installer won’t complain about my old CPU (an AMD A-8). Some time next year, I’ll find out if it really works or not.
I wonder about disk wear ( HDD not SSD). Would not leaving it spinning all the time lead to more disk wear, compared to, say, turning it on for 1 hour per day?
I unplug my external backup disks when not doing backups. I am sure they will last longer than if I left them spinning.
I unplug mine too, but not to save disk wear or power. If they are connected and some sort of virus or spyware or ransomware gets on the computer, the backups are safe.