There are more than one way to deal with any issue. So far, between the Stinger and G70, I've bought 2 sets of Enkei TFR rims, 2 sets of performance all-season tires, plus 1 set of TW200 AutoX tires, and I haven't spent anywhere close to that much. I took off the OEM 19" wheels/tires even before I left the dealer parking lot and sold them for $1500 soon after. That money almost exactly paid for Enkei TFR 18x8.5's and tires they replace, so basically no-cost exchange. Genesis does not own a monopoly on low profile tires and the associated damage risks. Many of the Euro and Japanese competitors have similar wheel/tire setup, if not even worse. As long as folks keep liking the donk look, car mfrs are gonna keep pumping out big heavy-ass rims and rubber band tires.
The Brembo brake pad issue, however, is legit. Genesis/Kia continue to shoot themselves in the foot by not addressing this problem properly. That said, there are ways to mitigate this issue without spending crazy money on the EuroSport pads. While I'm glad our 6MT G70 came with those, I'm not buying them when it comes time to replace. There is a long thread here on this issue, and folks have found good alternatives, depending on your preference and usage. Because of the crossover with Stinger, aftermarket support for G70 is excellent.
Spark plugs?! I just bought 1-higher heat range NGK plugs that work better with JB4. About $14/plug. Same heat range replacements are about the same cost. Not sure what the problem is.
Anyhow, I hope you have better luck with your new steed.