Better than genshin but 40 gems is half a roll so not worth on the long run, i don't regret but it's better to never do it. U only found out because some rookie week challenges required it, even a youtuber i saw who plays CN version didn't know this.
At least it's way better than just buying cash with gems, as you can use that stamina on the farming stages and even mats or weapons too.
btw in some gacha news, the chinese voice actor for Rover was innocentized as the police got involved and the person who called her a doxer publically apologized for spreading fake news. If Kuro really fired her for it then it really is their worst case of #DevsListened and they made sure she'll never work with them again.
In some dumb fandom news, Skirk VA had to apologize publicaly on twitter as she made a tweet saying Skirk and Rerir (nodkrai villain) would be a cute couple as a joke, where the joke is that Rerir voice actor is her boyfriend. This did not go well with genshippers who seemingly called her a "pro-shipper" as this is """grooming""" since Rerir is older or something (this is only an issue when it's straight) and "out of character" as skirk is """lesbian coded""" or something.
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I feared she was getting too close to the fandom for her own good, but staying away from twitter will do her good overall.