Why would they?
Put yourself in a prison bureaucrat's shoes. There is no upside to changing the rules, easier legal work or whatever for the inmates doesn't affect them (hell, it might even cause more work). But if they do change the rules and something bad happens (like, shock horror, somebody smuggling in a picture of a naked lady), it's their ass on the line for approving it.
One answer to that is that prison bureaucrats shouldn't be in charge of deciding stuff like this.
Except that whoever you replace the bureacrat with to be in charge, then becomes a defacto bureaucrat themselves with all the same incentives and disincentives. So the situation remains unchanged.
lets get a buncha folks who have no idea about prisons, prisoners, and in most cases technology, and have them make decisions about how to handle sociopaths and technology.
that would only get ugly.
The downside for them is more like: prisoners get released earlier, so they don't make their quarterly earnings targets, so that's why their asses are on the line.
Seems pretty serious and probably very real KPI. We live in a capitalist society, after all.
Why does the parent get downvoted?
Because the majority of prisons are not private and all the perverse "muh headcount, muh resources, muh silo" incentives that you see in government are more applicable.
But the private prisons have lobbyists trying to shape legislation. I doubt the state-ran prisons have similar sway.