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I understand the draw of single brigade offense and defense. But do you think we miss the opportunity to teach players that brigades must match to play enhancements if we do that?
Another idea is to have two different Starter Sets, if you still want one that's like the I/J deck, very simplified, and another one that's more complex and goes into more of the game (or you could just keep the I/J for that and have K/L be the moderate complexity deck that covers the majority of the game.
Just tossing this out there (and I know it wouldn't be simple), but if a starter deck or decks could be combined to make a T2 deck, that would also be a great way to get some players into T2 that struggle creating the decks or getting cards for it.