Capable of what, sounding pleasing, OK
But as any serious alternative to a real 5.1 and better multch system, not even close.
You can't make a relatively small line of speakers across the front of the room give the immersive experience of 7.1.4 Atmos system no matter how much magic dsp and phasing games you play.
Or maybe I can sell you a $15,000 6' power cable?
More and more of them can pair with wireless speakers for rear channels and that works well. I am not saying that sound bars are better than a good AV receiver and multi-channel speaker solution, but they do offer excellent sound quality and the assumption that a traditional system would sound better is no longer true as I do think there is now an overlap. For many people the simplicity and ease of set up will far outweigh the negatives and I can understand why.