Howdy...
It is perhaps easier to consider that the two systems are offering two ways to input command. Both have two stations, one has split input engineered into it. In an arse about look, consider that the yokes are made smaller and put on either side of each pilot. That is architecture alone. Now, consider the yokes can be manipulated differently, with simultaneous and differing command, but to a computer?
In making everything computer dependent, Airbus has missed something, the need for Bulletproff CRM. The possibility exists that command is in some cases made murky by a design, which should never be the case?
Split input engineered into it? Why yes, else "summed solution" would not exist. Can one say the split input is an artifact of poor design? Without question. For that to be considered wrong, one would have to say split input was inadvertent. I think the designers might take offense....