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A 16 penny nail is 3.5" long. You should be using 8 penny 2" nail on the 7/16th chip board. Same if it is 3/4".
now if you are using 20 penny you will need plates.
It’s not that you know where the wires are, what about when you sell your house and the new owner nails into the wall. They’re cheap insurance from electrocution - what $50 for 100?
The only place you need nail plates is the few spots where you drilled through the studs and passed wires through them in a way that might be vulnerable to nails/screws. The stuff you have run behind the studs are fine as is. I didn’t see how you brought wires in/out of the sub panel? I know in my house there are a couple of big @SS bundles of wires passing through a top plate on a wall right above my panel and i have nail plates right there to prevent catastrophe. There aren’t many other spots in my whole house that needed/got them.