I think the quality of soundbars and reduced quality of audio on streamed video has made soundbars a very popular option rather than full surround sound.
Saying that I have a proper 5.1 system* – which is in constant use and no rush to go back – absolutely love it and the luckily my wife does too.
It always shocks me how bad TV’s sound!
*5xSpendor speakers, Naim process and amps all around plus REL sub.