How much AC does a straw man have in wet towel armor?
Some armor is better than others - as far as the protection it offers. But that also comes at a price. Heavier (and thus, more protective) armor tends to have drawbacks other than just cost, it also tends to be more cumbersome. The problem with the armor chart they had in the last packet was that there only ended up really being a point to even having one type of armor per category, because it was better in every way than the other types of armor in its category. So the only thing that separates the armor types is cost. As soon as players can afford to upgrade to the best type of armor in the category they wear, they will, and save for plate armor, that's probably going to happen pretty quickly, if not after a single adventure. So why even have all of those other armor types in the game, if they become totally obsolete and there's absolutely no point in wearing them besides saving a little money?
I want there to be a point to wearing hide armor instead of scale mail, or chain mail instead of plate. There should be tradeoffs for taking the absolute best AC you can get. This also helps the game from a gameplay point of view. One of the problems in the game is the outrageously high AC scores that characters can achieve, making them almost invincible in a system with bounded accuracy. If there's a point to wearing some of the armor types that have lower AC scores, it helps to reign that in a bit. Not every heavy armor wearer might choose to wear plate. One might opt wear something with less penalties instead, sacrificing a point or two of AC for mobility. IMO, that should be a valid choice to make. Not, "LOL, you're level 3 and still wearing ring mail? What's wrong with you?"