Pin1 is connected to GND on the Joycon side. If you look how thin the trace is it is used for signalling to the Console indeed.So 1 and 10 are best on this alt pin out. Good to know

Pin1 is connected to GND on the Joycon side. If you look how thin the trace is it is used for signalling to the Console indeed.
But there is no problem with that as we want to drive a IO to LOW, better: it gives you some sort of chance when a shortcut is made. - but this is hypothetical did too much PCB Layouts the last months![]()
Pin 9 is hard wired to ground on the Switch side. The Joy-Con probably just uses it to sense when it's connected to the Switch. I know the pinout claims pin 6 is used for that function, but it could be that the Joy-Con uses some combination of pins 6 and 9 to figure out whether it's connected to a Switch vs a charging gripI am a happy camper with 1/10 and a 2K5 Resistor in series to have no high currents on fault....
Why not do what the devs initally said: Pull Pin to GND - and Pin9 is driven by some logic on the Joycon side.....