Lack of short term IR

I understand the rule change but it’s essentially short term IR. I also understand that there’s a cap on players that can be brought back but I don’t see how we’ve allotted those spots already. I just can’t understand how it isn’t being utilized to at least some point (Penning is one). Are we really that bad at evaluating injuries that we’re holding roster spots for players that will continue to sit and take up valuable spots? Or are we at the point where there’s more players than I’ve realized that may be designated for return. I also understand that you need to keep a couple spots in your pocket and can’t spend all the house money right away.
Again, there is no short term IR! Get that out of your head. It's all the same and there's only one list, it's called IR. If you're on it for more than 4 weeks, then you stay on it. You don't get transferred to a different one.