This is like saying you take the battery out of your Casio wristwatch at night to conserve battery.
Apps in Windows and KDE don't really change their behavior just from having a touch screen.
I routinely forget that my Framework 13 Pro even has a touch screen.
Every watt matters, and turning it off hurts nothing I care about.
And apps DO change their behavior. The on screen keyboard pops up when the screen on a KVM connects before the keyboard.
Why the hostility? I’m not going to touch my screen anyway to try to avoid making it filthy.