The US has a small set of valid bank notes. It's not like other countries that have multiple issuers, each with their own schedules for when to update designs.
On top of that, this isn't just a design that a person hasn't seen often, it's a denomination. Think of the 500 EUR notes, they were unfamiliar to many people.
On top of that, this isn't just a design that a person hasn't seen often, it's a denomination. Think of the 500 EUR notes, they were unfamiliar to many people.