Yes, but also no? We (people on the ground) treat this all fairly interchangeably (it's just a bill, they're all the same) but from the mint's perspective, years of work and tons of money go into each one. They cycling function between bills probably keeps costs down (because it's not all being done at once) while carefully cycling old currency out of the economy and cycling new currency in.

Now, it you want to argue for a mass overhaul, I suspect Congress is the place to go. (Hahahahahahaaaaa *wipe tear*) But as an internal mint system to keep money safe from counterfeiting while also replacing the worn-out and torn bills, this system doesn't seem artificial in the sense of building barriers. It's really well made for the priorities of the mint. Who probably care very little who is on the money, all things considered. (It is artificial as in man-made. So is capitalism!)

In conclusion: Congress; probably the only power that can enact widespread change on this one. But considering the fact that the penny is literally wasting American millions of dollars a year to keep in circulation and they have done nothing about it, I doubt it's the best way to go.