While I’m not such a fan of how simple the concept of the inferno modifier is, there are certainly positive things to take from all this.
Probably only applies to people still farming for nonsense reasons but I do like having a reason to run heroics again. I think a lot of people have forgotten what it was like to CC mobs in TBC and tiptoe past the guards. Now we actually need to perform mechanics that were already there and being ignored, those are the modifiers that come hand in hand with it.
I do like being able to upgrade via currency, and if you want it strongly enough then the item’s there to be had. You aren’t at the whim of RNJesus to lube up that week for the only boss you need.