What does "need" have to do with it?
Actually, right now I am in Poland, so nowhere. Everything I own is in Texas. I only carry in Texas and Oklahoma, although if I were to travel in the US and it were legal, I would carry in other states too.
"Need" is very subjective. The chance of my having to defend myself is extremely remote. If involved in a self-defense situation, the chance of my using a backup gun or needing to reload is also extremely remote. If I remember my math correctly, that means the likelihood of my "need" is near zero.
According to John Correia (Active Self Protection), even in defensive encounters, I am highly unlikely to reload, and even less likely to "need" a backup gun. I am sure he's correct. He's also certainly right when he says we're far more likely to need/use medical supplies, a flashlight, or a knife than a spare magazine or a backup gun. Again, I am sure he is right, and I always carry a knife, a flashlight, and every vehicle has backpack with an IFAK, regular first aid kit, water, and other supplies.
I can absolutely see wanting to have a gun I can give to somebody else in a sketchy situation or area. I've actually had that happen, where we knew we were going someplace bad, I couldn't legally carry, but my co-worker made sure he had an extra firearm and laid it right next to me "just in case." I like the idea of having a gun in my left cargo pocket or inside right ankle to grab with my left hand. I like the idea of being able to easily access a pistol while sitting, like in a car.
If I can get a rig that's not too uncomfortable, I'll probably wear it regularly. Do I "need" it? No. Most Americans will go through their entire life without ever needing to personally defend themselves either. I still carry.
Let me know if your friend has any more questions about how I assess and mitigate risk for myself.