I've thought about it, but aren't the Wuwa devs quite devious?
People always compare "generosity" between gachas, but they almost never mention how the Wuwa devs split their free rolls between weapon and character rolls.
So when they say "Wuwa gives you 10 more rolls!" they don't mention how those rolls are weapon-only.
As someone who never rolls for weapons, it seems like a pretty devilish numbers trick to me.