Thanks for the replies. Since posting I have also found a post that suggests that they are doing this because a particular tool may get dropped in newer versions so keeping an older version gives you access to the tool. Personaly I'm not that bothered and would like, on update, to be given the option to delete the older version. I think Adobe should also make it clearer, when a new version comes out, what tools are added\removed (maybe they do but I've never seen it, I just get a notification that an update is available).
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