I'm going to go on a bit of a rant here because I hear this all the time so please forgive me, "it's a Kia, you're going to get massive depreciation!" I've been checking out other similar cars and their depreciation looks to be just as bad as the Stinger or far worse from a dollar perspective. Take the Infiniti RS400, MSRP is around $55k for RWD, those suckers are going for mid to low 30s with under 15k miles and a 2018 model. Audi S5, MSRP is around $60-65k, they're going for mid to low 40s with under 15k miles and a 2018. Let's try an SUV, BMW X5 xDrive50I, MSRP $80-85K, they're going for mid 50s under 15k miles and a 2018, that's roughly THIRTY THOUSAND dollars in ONE year.
Depreciation on any new vehicle is garbage unless you have some kind of rare and highly sought after model. I paid 37k for my new GT1 last year, 10k miles on it now, looks like my car at the lowest prices on autotrader is going for mid 30s still, pretty damn good in the depreciation department I would say. As long as you get a decent deal when buying new, which everyone should be at this point, you shouldn't take much of a loss in the first year or two.