Thanks for that.
The TV mute issue is easy to solve by many means. It is trivial to fix if you have any background in electronics.
However some folk feel it's a design flaw. Go figure.
It's like a hood on a car that won't open without knowing where the latch is. Any good mechanic can fix that by showing where it is or bolting on something to make it easier to find, but the usual driver would call it a flaw because they are not a mechanic.
It depends on your point of view if this is a flaw or just something we need to adjust.
The next person would write it's a flaw to not mute the speakers when the headphone is plugged in!