Thank you for making this post.
I haven't gotten into marauder in 6.0 yet, but as a player who started playing on a mara, this change makes me mad. I don't see any reason to remove this, and it will make playing mara feel so much more slow and weak before your opener is over.
I completely agree with you, brooding should become a passive for all maras, and there is no reason why it's the only class that has zero resources before it enters combat.