Why aren't there other status protection IOs?

Random thought: There are a couple IOs that confer knockback protection.
Several ATs suffer for lack of some other form of status protection. Judging by forum participation, representatives of one AT are endlessly bitter about it.

Why not offer an IO with, say, Mag 2 or 3 sleep or hold protection or something?

I'm thinking this would work pretty well in resistance sets, just like Steadfast Protection. All the ATs lacking status protection have access to a resistance-type armor in their APP or Patron pool and from Tough.

Sleep, hold and stun are all common enough effects that building for truly worthwhile protection would make slot allocation problematic, assuming that the per-IO magnitude were sufficiently low. The IOs in question could even be unique or attuned to a particular character.

I've never heard anyone suggest this before. Is there some reason why it's completely off the table?

Because status effects are *supposed* to represent problems for some ATs. If IOs existed for protection from sleep or hold or stun, why bother having status effects at all? At that point, the only thing they'd do would be to enforce even bigger performance gaps between IO'd characters and SO'd ones - in fact, I'd say that the performance boost from being able to slot for significant mez protection would probably be *equal* to that available from *everything else* you can do with IOs. I don't think it'd be a good idea. IOs are already powerful enough.

In my opinion, -KB IOs exist because knockback has got to be by far the most common 'mez' type in the game. And you can get away with having them, I think, because you don't have any *other* mez protection IOs.

Impervius Skin and Aegis have Status Protection enhancements in their sets but they reduce duration and do not confer immunity to being affected in the first place.

It's a decision the Devs have made... if everyone can get around mez with a set and forget mechanism, there's no point in even having it. I believe the mez protection/ no mez protection divide is much larger than it should be, but that ship sailed in... roughly... 2005. (I think they could have dropped mez protection mag for melee chars when they nerfed all the other defensive powers; they did not.)

I also think KB for NPCs is hideously overpowered and hideously overcommon- if you don't have Acrobatics, KB protection or a KB IO, in the mid to late game expect to spend about... 2/3 of your time flopping around like a fish while the enemies beat you to death at their leisure. And I think the -KB IO (acrobatics-in-a-can) was somewhat of a workaround for that, but it has a lot of the same functionality as a power that's already available to "Anyone." (Yes, I mean "Blasters", I have about twelve, what's your point?)