@Kefke What Drew meant are coded limits. Terraria has no coded limits for DR and life regen. They can be, and are in some cases, stacked to extreme amounts by mods. Sure, this would be the mod's fault, but an easy-to-code limit would have stopped this from happening.
What Drew is trying to achieve here is to get rid of these flaws, although some might not be as convenient and/or thought out as others, he tries his best to do so while keeping Calamity unique.
P.S. One thing most people forget is that Drew is one of the few major mod owners who doesn't ask for donations nor accept them, he does this as a hobby alongside his actual job, yet he gets incredible amounts of hate for it. It doesn't feel nice to know a large part of the community dislikes you, and all it is going to do is going to make him angrier to the community, including those who do provide valid criticism or bring it the way you did. At least cut him
some slack.