5.1 was a revelation compared to previous formats. One of the biggest steps made ever for home entertainment.Pretty sure the marketing surrounding home theater that arrived in the 90s along with the initial Dolby 5.1 spec greatly exaggerated that which was actually delivered. The 5.1 spec morphed into 6.1, 7.1, 7.2, and eventually 5.1.4, 7.2.6, and 9.2.6 with the arrival of the Dolby Atmos spec. Consumers trying to keep up with spec changes wound up purchasing 3 or 4 receivers along the way and eventually came to realize that to replicate a theater experience in your house meant building an accrual theater in your house. AVR sales fell off a cliff and most households decided a soundbar was good enough.
Atmos is a significant step up from the bed-layer focused formats.
The fact remains that most people apparently don't appreciate it nowadays as it is cumbersome to implement in the living room.
Another fact remains - soundbars do have steep limitations and whoever implements it is willing to live with those.