To be honest I think this will also be a cheaper easier way for airlines to offer a flexible euro business style product. Instead of needing tooling to change the seats it looks like just the arm rest is moving. Quicker and cheaper than the old clunky converter seats potentially without the need for an engineer.
It could also be used by a person of size or two persons of size. They'll be able to fit in the arm rest.
It's better than the racketeering of charging them for two seats, then assigning them a second seat on the opposite end of the aircraft which I Have heard of before.