The AV receiver and indeed the speakers shouldn't or wouldn't be on display in a dedicated home theatre.
What are you saying here, that people who purchase soundbars are trying to replicate the dedicated home cinema room experience, and they choose them over receivers and speakers for this reason, because receivers and speakers pose an inferior experience in this regard if they are out in the open?
People purchasing soundbars aren't buying them for their looks. They simply want something that is better than their TV's speakers that can be discretly located below the TV. As I said earlier, they are lifestyle products.
They do buy and settle for vastly inferior audio products and the quality of the experience, because of their looks... Many who purchase soundbars don't want larger speakers, recievers/amps, and subwoofers, plus more cables etc, it's not a "clean" look to them (this is
regularly said in dedicated groups on Facebook when people rate other peoples setups... Soundbar setups often get a lot more likes than very good and nice receiver/speakers/subwoofer setups on there too), therefore, they care about and place a lot of importance on aesthetics of the equipment and their homes, over performance.
Why on earth would anyone want a soundbar that is noticanle? You buy both them and AV receiver to do a particular job job, not as items of furniture you look at rather than watching the TV.
It's not just about doing a particular job for some of them, they also want to show it off to family, friends, and work colleagues, as well as others all over Facebook, Instagram etc (there are some who consistently post the same photos of their soundbar setups multiple times a week in social media group threads, even when people haven't asked to see others setups), and the general consensus amoungst these people is, that soundbars 'look' much nicer.
They also aren't very technically minded in the world of home theatre equipment, they believe they are though, and the only people they ever talk to about it all is like minded people, with the same opinions and knowledge.