theyre on a date!!
I don't mind Peridot losing her limb enhancers in theory, but the points you bring up really make it seem like she's wasted as a character. She's lived on Homeworld, she knows what their modern technology is like. If not being the tech expert for the Crystal Gems, she could be their intel gem. And yet her only acts as a Crystal Gem are building a drill and playing Wile E. Coyote.