And regarding Latias making other teams "less viable", that was never my argument. I argued that it creates a massive incentive to use Dragon and Steel types; it makes this type of team more viable than a standard Platinum team.
I take your point on everything you said except this. I don't really see how it creates a massive incentive to use only two types, as many have already stated that "regular" teams are still unaffected and just as successful. Anyway, I would be happy to bring this up in the Latias discussion thread or PM since I don't want to clutter your RMT anymore with an argument.