These games were nearly done with development before Sony introduced Trophy support. They aren't cutting features of their titles by not having Trophy Support. A feature would be something that has an impact on the overall experience, not something trivial like Trophy or Achievement support.
Sony is implementing that all developers must use Trophy support by this Fall and in 2009. It's not that big of a deal. If you want Achievement Points, then by all means get the 360 version of the game you want. If you base your enjoyment on getting little perks in a game, then you are playing the game for the wrong reason if lack of Trophy support is stopping you from getting the said title. Give it six months and every developer will be supporting the Trophy system.
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