Tbh, The leveling curve should be reduced by at minimum 50% permanently. There's literally months of grind to do once you've gotten to max level, which is far longer than your average gamer plays a title.
And if you think I'm joking, here's a few numbers.
Valor Shop Passives: 140,000 Valor [average 120 per dungeon run] = 1,166 runs not counting dailys.
Another 11,000 for 1 Equipment set of Valor Gear = 91 runs not counting dailys.
Runes: 1k each, average 4 runes per char = 4,000 valor = 33 runs.
Rune Materials: RNG, impossible to calculate reliable average due to RNG on gaining materials, as well as Empowerments being successful. 'Rough' Estimate: 4,000 runs.
Refinements for Items: averaging 2,000,000,000 zulie a piece x6-7 slots: roughly 13,000,000,000 zulie.
Purchasing Honor Passives because conversion are too costly, probably ballpark another 50,000,000,000 zulie.
NOT including the rune RNG runs, if the average run took 10 minutes to do, and 5 minutes to qeue that's 322 hours of game time. It's triple those hours for the runes, so around 900 hours. For 1 character.
These are all rough estimates based on averages from personal experience, your experience may be different either positively or negatively. But if I'm averaging 900 hours to gear 1 character to full end-game potential, WITHOUT the time it takes to actually level the character? That's too much.