Earlier quoted context omitted.
One wonders what the judging criteria are for sound mixing at the Academy Awards, since it certainly seems like "legible speech" isn't one of them.
Most production are not made with the passable quality of reproduction that a sound bar provides in mind. Mix are made for a THX compliant setup where the center speaker is responsible for over 50% of the dialog delivery. If you skimp on the center speaker quality and placement, the dialog mix gets muddy quite quickly.
Certainly, modern very thin TVs have a very uphill battle to fight, but a good center doesn't fix everything.