I'd argue that, yes, they are difficult to manage. Not from a logistics point of view, but from a physical one. I carried my wallet in my back pocket from 16yr

I'd argue that, yes, they are difficult to manage. Not from a logistics point of view, but from a physical one. I carried my wallet in my back pocket from 16yrs of age to 34 and always ended up with broken or bent cards. After taking a cruise outside of the US, I started carrying my wallet in my front pocket for security purposes and started researching minimalist wallets to reduce the bulk. I've backed 2 of those on kickstarter and am eying a 3rd, because the first two don't allow me to acces my cards quickly enough when I have more than 2 or 3. For me, this solves multiple problems: it makes the minimalist wallets out there that much for functional because now I only need my coin card, my ID, my insurance card and perhaps a backup credit card for any merchants I run into that won't take the coin. 4 cards down from 9, not including any rewards cards which could push it up to 16 easily sounds like a good deal to me. It also keeps me from forgetting lesser used rewards cards and credit cards at home because they're either in the coin already or in the iPhone app and can be switched into the coin when needed.