shadowlance
First Post
We're coming at this from two different angles I think, which is fine really. Dodge and other dexterity-related forms of damage avoidance strike me as being at odds with how I'd perceive the iconic defender type. The fact that heavy armor neutralizes dexterity bonuses to armor reinforces that and justifies the idea that feats that grant bonus armor on an avoidance- or dodge-basis would likewise suffer penalties for heavier armor.
In other words, if you're weighed down by heavy armor you really can't scamper and dart between a large-size enemy's legs. If you aren't wearing heavy armor, you start with a much lower base armor class and it becomes a very good question as to whether or not your dexterity/dodge-type bonuses will make up the difference.
It's also a bad idea to assume a defender will "almost always" be up against large size creatures. One of the demo modules involved fighting swarms of small-sized kobolds.
Well, for Lost in the Crowd, the creatures only have be be larger than the halfling. Since the halfling is small, that means medium or larger. It's probably NOT a bad idea to assume that the defender will "almost always" be up against medium size or larger creatures. The occasional kobold/goblin swarm notwithstanding.
As for dodge style bonuses being clipped by heavy armor....while it's possible, that's not how it works in 3.x (aside from the dex bonus itself) and we haven't seen anything (that I know of) that indicates it will be true in 4e either. Heck the pregen halfling paladin from DDxp has plate mail AND Lost in the Crowd. But the fact that heavy armor will apparently still inhibit dex mod AC bonuses is a valid one that is certainly on point.