Just my two cents
Back in 1988, I had a Kenwood KA-V1000R surround amp.
It was 80 watts, front and rear surround, with no center channel.
I listened mostly to music; but when I did watch movies, I
would always turn the volume up.
We had trouble hearing the dialogue. For years I was under the misconception
certain movies were just recorded badly. The movie Backdraft comes to mind.
Well I was wrong. It was my four channel amp.
Years later when I retired the Kenwood to bedroom stereo duty, I got a proper 5.1 system. We found the center channel made all the difference in our ability to hear the spoken word, and transitions across the soundstage.