I don't recall ever saying oxford is an 'optimal strategy.' People are essentially saying you should never build it. Cseanny has played a number of deity games recently building oxford and, it seems to me, winning easily and early. Like any of the accepted strategies, it works for you if you beeline it as part of your overall game. Cuirs aren't much good either if you take too long. If you get oxford up in a very strong commerce capital by 200AD, it would appear that you can benefit quite a bit from it. This is not some far fetched 'avoid bronzeworking' so called strategy, it's foolish to assume it's worthless because you don't do it.