Scenario (common in my case):
Dark in the room, 5am or 8pm, the monitor at a distance of 1.5-1.8m (this is also because the keyboard is wireless, yes ?!), Windows 10 with Dark Theme and Night Light activated and...What if I can start or turn off the keyboard lighting from two mouse buttons, at my choice ?

Why should I press a combination of two keys on the keyboard in the dark when I can press only one button of the mouse, which means I use it anyway for simple things, opening a browser, surfing the Internet, update/settings Windows, Logitech Options+ settings, etc ?
In fact, why should I touch the keyboard if for the moment I don't need to write something, or do more complicated things ?

At the moment, the fn+F6/F7 combination cannot be entered, neither as smart action, nor as a keyboard shortcut...
So, maybe ??? :)