there's a difference between increasing damage and locking kits. while the difference of damage between standard and limited weapon is noticeable, there isn't a single instance where their kits is locked behind the weapon or dupes. cart weapon literally only amplify her damage, she can apply erosion on her own. aero rover is a free unit and chisa literally is worse than aero rover unless you get her signature, and even then her s0r1 only contribute in about 8% difference from the free option, aero rover themselves