The upgrade system is broken beyond repair
You grind for weeks to manage to obtain the items you need to upgrade armor/weapon/jewelry to have a chance in a cold day in hell to succeed, 10-15% chance of success for jewelry are you freaking kidding me? It takes a lot of time to collect all those items doing the same dungeons time after time to fail miserably time after time. Is this what the devs intended to keep you in forced labor? To do the same menial tasks time after time for a chance to get an upgrade that is close to impossible? To me this is just laziness from the developers, instead to create more content, new areas, more dungeons they decided to force players to jump through hoops like trained dogs to do the same things time after time to create this time black hole where players will spend their entire lives trying to fins Shangrila with no success. This is just ridiculous.