I know everyone thinks I'm a zealot, but... I have no problem with C&R on the big name streams. We should promote and protect the wild browns in those places. They bring money into the state, are wildly popular, and I think there's a biological justification for it. I think the slot limits on Penns, and I suspect Spring soon, are good too, though. They're going to result in even more, bigger brown trout in those streams as evidenced by the trial run on Penns. I am not suggesting, nor do I support, the complete eradication of BT from PA waters. It's impossible. I do think in some remote brook trout strongholds, we should have regs that favor the harvest of browns/rainbows at a minimum. If for nothing else, the message it sends.
I also agree with you though that in less pressured fisheries, limited harvest of BT may actually benefit the size structure. Basically "slot-limit-lite" type approach, which, to be honest, is basically what we have on BT Class A's. As I've said before, for brook trout, I doubt angling regulations would have any significant impact on the size structure of brook trout in MOST waters. However, the message it sends to the public is worth far more than any result you can measure with an electrified backpack and an Excel spreadsheet.
More broadly, my biggest issue with the state is that from outward appearances, they completely ignore brook trout while focusing on absolutely everything else.