My theory is that many people don’t have space for speakers. Soundbar sounds better than TV speakers.

I also think the focus on surround means people don’t consider stereo speakers. Good bookshelf speakers are better than surround kits and easier to install. I also wonder if normal speakers are no longer cool.

Finally, I wonder if people don’t like the big receivers. There are small amplifiers but I can’t find one that works in home theater with HDMI port.