I don't claim that there needs to be more customizability. I just say that there is an audience for functionality beyond what LO offers.
Maybe AOO will follow LO in imitating Excel for the empty cell behaviour or not. I wouldn't be surprised for either outcome. But the important point is that it's only one decision of many, and this is very much the spaghetti sauce lesson: a "one size fits all" product can never be as successful as a variety of competing products.
I fully expect that AOO and LO are going to diverge. AOO will start integrating Lotus Symphony code and possibly become more "enterprisey". LO has demonstrated a web frontend and collaborative editing which show a path in direction of the cloud.