I have a few friends on FB who are reposting a story about Trump removing the ridges from the quarter.
I would assume it cost more to make these ridges as when the die gets dull, they have to replace it sooner than a di with a smooth edge. I could be wrong though.
But the ridges are old school when quarters/coins used to be solid silver/metal. People would use a knife and shave a sliver off to keep for X reason. Thus coins would get smaller and smaller and not hold it's true value. So the ridges were put on so one could easily tell if anything was shaved off.
The left is still looking for any reason to bash Trump. What they don't realize is if he didn't have good morals, he could do what ever messed up thing he wanted to do cause "fuc* it, they're gonna talk bad about my decision anyway". They have set the precedent.
The reason you gave dates back all the way to the 17th century in England before the US was colonized. Once the US Coinage Act of 1965 was passed, the metal composition of coins no longer makes clipping the edges worth the trouble even if the ridges are removed.
After 1965, in order to save money, they saw no real reason to change out the existing machinery since the ridges caused no issues.
Assuming machines are at end of life and that newer, more automated minting machines are available, maybe it's time to consider a redesign,
There is still one reason to keep the ridges. They help the visually impaired tell dimes from pennies and nickels from quarters. I think one thing that could help the visually impaired is have the Braille for each denomination stamped on the front and/or back. It could be easily incorporated into the design without too much trouble, and it would be more specific than having the ridges alone to go on.
Braille for the 4 denoms would look like:
01 => ⠂
05 => ⠢
10 => ⠂⠴
25 => ⠆⠢