Pyramid Head's cages are worryingly in direct opposition of the current dev philosophy on tunneling.
The main benefit of cages is that they deny on-hook perks, such as DS, Off the Record, Deliverance, Shoulder the Burden, etc. They have other, side benefits like denying flashlight saves, sabo-plays, and being faster than hooking, but pretty much nobody will deny that the main benefit is making survivors who have been uncaged more vulnerable to being killed than survivors that have been unhooked. Even Punishment of the Damned played into this, providing the ability to hit multiple survivors at once, allowing you to hit the person uncaging and the person being uncaged simultaneously, often resulting in an instant re-down before the recent nerf.
With the nerf to cages, now offering BT and Haste upon being freed from them, Pyramid Head has gone from the King of Tunneling to the Baron of Tunneling, but he's still a part of the Tunnel Royal Family, even if he's not the reigning monarch. I worry about what this means for him in the future of DbD.
Pyramid Head's funtime tunnel boxes were introduced during a period of the game where the devs deemed it survivor's responsibility to avoid being tunneled, meaning they had to bring perks like DS or Borrowed Time if they wanted to avoid being tunneled straight off hook. Cages were PH's means of countering these perks, but it was still very possible on all killers to tunnel directly off-hook if the survivors didn't bring anti-tunnel perks.
Over time, PH received nerfs to his tunneling ability, such as losing the ability to see cage auras, while survivors became less directly responsible for not being tunneled through things such as basekit endurance and haste. Even so, Cages were, until recently, still an outlier, but now they grant the same basekit protections as a hook does.
Even with this change, I ask you what the primary benefit of caging someone is? If you said tunneling, you would be right. If you said "the cool animation", then you're wrong, but I like you. The primary benefit is still the fact that cages deny off hook perks, meaning, again, no DS, no Borrowed Time (still basekit endurance), no Off the Record, no Shoulder the Burden, and no Reassurance. Most hook-related survivor perks are related to that particular survivor not ending up on the hook again for a certain time. Survivors also cannot uncage themselves if the killer camps, they are simply moved to another area of the map, which itself can be a good thing to deny a save.
With the recent PTB, it's clear that the devs are at least toying with the idea that killers themselves should be responsible for survivor's not getting tunneled through the benefits and penalties related to unique and total hooks. They rescinded the changes due to the backlash, but I doubt the idea will just be discarded entirely. This leaves PH in a funny place. His power is designed around tunneling, yet each update the game gets seeks to push tunneling away from being a viable meta. This makes it feel like PH is designed around a gameplay strategy that BHVR no longer supports, and I worry what it means for his place in the game.
I'm not sure what could be done to rework his cages, but I do feel like something will eventually have to be done or there will be significant consequences to his playability. On Reddit, it was suggested that his cages could potentially function as scourge hooks, allowing him to benefit from on-hook perks and providing unique gameplay opportunities. PH has no mobility, so the ability to remote hook wouldn't be OP on him.