Its definitely the leaf. I noticed the leaf in the W is more dull than the leaf in the E.
I looked at the stems, the housing, and the springs and saw no difference.
You can really see that the right leaf in the left switch is worn and a little discolored.
Sorry for the mediocre photography.
![Gateron switches get scratchier over time? 202034-0](https://geekhack.org/index.php?PHPSESSID=a4atetf1do0o3cto38bm9v391k0r5j1o&action=dlattach;topic=97026.0;attach=202034;image)