Agreed. The thing about Peridot's arc is that Steven is already pretty eager to trust others. Peridot wanted to save Earth because she was stuck there and didn't want to die; the fact that she wanted to save the Earth at all for any reason made Steven want to trust her and give her a chance. Even before that, After Jail Break, Peridot gradually became kind of goofy and lovable to the audience, even as a villain.

I think the reason that a Jasper redemption arc seems like it would be cheap right now is because she's only really been in two episodes and we don't know anything about her beyond that she gives no fucks about Earth and it can be inferred that she wants to smash Rose Quartz in the face super hard. I think before Catch and Release, the idea of a Peridot redemption arc seemed kind of cheap, too, but they did it okay. I'm pretty iffy myself on the idea of Jasper being "redeemed" but I can fathom it working. I don't think she'll really become a Crystal Gem, but I can see her possibly turning against homeworld.