When you run into an RNG wall as big as +15 enhancing, people will eventually become discouraged and quit. Some are more resilient than others, but Devcat is trying to keep its players and make them feel like their time invested into the game is worth it, not have 40 hours of grinding go up in smoke while trying to go +13.
Definitely not asking for a free +15, but I would much prefer having the process of getting a +15 actually have a more slow long-term process that makes people feel like they aren't wasting their time on the game.
Once you become a real veteran. You will noitce how easy it is to gear up a char these days and how easy it is to obtain a +13 weapon.
If you think it is hard, you are not a veteran. (eu player here btw)