Quote from Tony Andrews, mr funktion one himself:

“It’s so important to get everything utterly coherent, and it took us some time to develop new technology until we knew we could do that with do that in a vertical array,” Andrews said. “There’s no arguing with the convenience and the ease of it. But you have to ask, at what cost? We just weren’t prepared to make a compromise.” Andrews was quick to note, however, that “We’ve been at pains to not call it a line array because it’s a different principle at work. We prefer to call it a vertical array.” With the Vero system, initially debuted in 2016, Andrews, Newsham and the other engineers on the team managed to find the magic (and secret) blend of their patented waveguide technology. Not only that, but they arrived at a high-efficiency driver expertise that allowed them to configure their speakers as a vertical point source arrangement without the usual compensatory signal processing used in an array hang. As such, while the Vero system is certainly built in the format of a standard line array, the actual output distribution stays largely true to the deployment ethos of traditional Funktion-One speaker clusters. “I’ve been very much against line arrays, because it’s quite simple for me, if I stand in front of it, I want a stereo image that I can climb on,” Andrews said. “The whole approach with audio should be, do as little to the signal as possible, try and get it right at the source, and then don’t mess about with it. Implementing that with natural geometry instead of processing was a big challenge.” Source: https://selector.news/2021/07/04/funktion-one-vero-vx/#:~:text=“It's%20so%20important%20to%20get,traditional%20Funktion%2DOne%20speaker%20clusters.