It dosnt make sense to sabotage your own product. However they may have felt that by changing the PC version they were going to annoy the Xbox user base, who they see as more important.
Same deal with the US and EU versions of the game. To radically change the EU version would have caused an uproar. It's funny that these compliants didnt actually surface until the PC version was released and by which time the "golden" sales period of the US Xbox version would have been way over.
In such a situation, playing it lo key and just letting it get forgotten does make some sense from LA's perspective.