Especially with how low the rates are, needing to get many dupes of a character to unlock all of their talents is awful.
People aren't noticing anything now because everyone is in the early game, but not being able to max out characters without lots of dupes is bad design.
There are already very few ways to develop your characters through gameplay. Most progression is done using either exp items or from rolling in the Gacha, and this Eternal Fortuna system is just adding insult to injury.
EDIT: Most other Gachas I’ve played with a similar system have an alternative way of farming for the same “dupe upgrades”. Dupes should never be the gating factor in progression, but an alternative faster way.