So I kept researching. And I found one lone Reddit post that claimed the ridges are added to make it easier to remove the wrapper. Now this answer made a little more sense.

Meet Andrew Athias, “The Reese's Guy.” It's his jawn: “Everyone has a favorite something, I just happen to be outwardly expressive about it, as a Philadelphian would. When we like something we're going to tell you about it whether you want to hear it or not.”

One person would exclaim, "You got your peanut butter on my chocolate!" and the other would exclaim, "You got your chocolate in my peanut butter!" They would then sample the mixture and remark on the great taste, tying in with the slogan "Two great tastes that taste great together."

The original incarnation of Reese's #NotSorry was a response to the campaign “Sorry, I Was Eating a Milky Way” launched by competitor Mars in 2012. The Halloween season is a highly competitive time for candy brands, as they attempt to lure consumers and drive sales ahead of trick-or-treating.

In the 1970s, the candies were produced by The Hershey Company using panning machines that had been used to make Hershey-ets, a chocolate-filled candy that had been discontinued. The candy was first called "PBs" and was later rechristened as Reese's Pieces.

According to the Hershey's Community Archives, Reese's Peanut Butter Cups get their name from their founder, Harry Burnett Reese. H.B. Reese started out in the candy business by managing dairy production for Milton S. Hershey.

Harry Burnett Reese (May 24, 1879 – May 16, 1956) was an American inventor and businessman known for creating the number one-selling candy brand in the United States Reese's Peanut Butter Cups, and founding the H. B. Reese Candy Company. In 2009, he was posthumously inducted into the Candy Hall of Fame.

The ingenious flavor combination in each of these treats can be traced back to 1928, when H.B. Reese, an employee of The Hershey Company, created REESE'S Peanut Butter Cups in his basement.

The ingenious flavor combination in each of these treats can be traced back to 1928, when H.B. Reese, an employee of The Hershey Company, created REESE'S Peanut Butter Cups in his basement. The Hershey Company supplied Reese with the chocolate coating for his candy and eventually purchased his business in 1963.

Reese's may not be the world's top-selling candy, but it is the king of American candy. Reese's was founded by former Hershey employee H. B. Reese in 1923. Since 1928, people everywhere have been enjoying Reese's peanut butter and chocolate creation known as the Reese's Peanut Butter Cup.

The ingenious flavor combination in each of these treats can be traced back to 1928, when H.B. Reese, an employee of The Hershey Company, created REESE'S Peanut Butter Cups in his basement. The Hershey Company supplied Reese with the chocolate coating for his candy and eventually purchased his business in 1963.

Reese's Peanut Butter Cups were named after their founder, Harry Burnett Reese, so it's a possessive form of his last name.