I’m not sure what jp use to sharpen but he does thousands of them so would make sense to use something mechanical?
I very rarely use any other rig than a multi rig. A lot of this is down to presentation, but you get the added benefit of being able to change the hook quickly. The sharper the hook, the quicker it blunts, as you well know. Some of the hooks out of the packet now are crazily sharp. Kamakura’s and pinpoints for example. I can now give them a quick touch on the doctor if they come in not 100% and I’m away fishing again. I haven’t fished a session longer than 4 hours since September, so speed is paramount in my angling. At trade shows when demoing the product, I purposely turn hooks over (far more than sinking on gravel or hooking a fish would do) and bring them back to life in seconds. We will sell less hooks now 😂
It’s not just carp anglers that will benefit either. Lure anglers, fly, dead and live bait, sea etc. They will all save time and money having one of these in their kit.