Ladd, as far as never turning off the STB that
is fine if it's in your family or other room in
your house besides the bedroom otherwise the STB's
display makes for a pretty bright night light,
for some it is just easier to disable the clock
and use a cable mute button.
I didn't say that your choices would be optimal, just offered the only one that would solve the mute problem.
Cover the light with paper or cardboard or cloth or tape if you want to ensure that you never have the mute issue.
If that is not acceptable (say, because you like seeing the display at times), than you will have to work around the mute issue when it occurs.
Unfortunately Motorola has ensured that it is either or.