That's something that I think gets hard retconned later, yeah. We get a look st Gold rank threats, and they're significantly more dangerous than a single nest of Shield Spiders, who the Horns (a Silver rank team of 4) are more than capable of dealing with with minimal risk.

The only things Erin really upstages the locals with are things that are purely cribbed from Earth, like fast food and plays, which are more novelties than anything and the things that can be replicated (like the food) are. And Chess, but she was a world class Chess player on Earth too.

The only real edge Earthers have is that they level faster, because leveling is based on stress, basically. The harder a time you have, the more xp you get. And since even simple tasks are out of most of their depths, they level fast, and even faster in truly dangerous scenarios (which is true for natives as well; "counter leveling" is a phenomenon their militaries have to account for when executing sieges snd the like).