The slim floorstander is a cludge the baffle is too small so they require BSC in networks.Woofers to small so they require multiple, most need porting and high excursion transducers, and high power to function well. They exist because they are cheap to build, and easy to ship, stock, and sell. Wide baffles are costly to build stock ship sell and thus are less popular among manufacturers. Keep in mind that much of what you think is SOTA is just profitable. Most audiophiles are buying mass-produced items, not SOTA designs. Just stuff others can make a profitable product out of for you to consume.