The car isn’t any more complicated than other '18s. It’s simply that they stuffed all that tech into a steamer trunk engine compartment. I simply don’t have a desire to tinker, upgrade, or modify and mostly not repair. Average decent mechanics tear them apart in their home garage all the time. (I don’t need double the HP or to run it on the track.)
It’s not a lack of parts. You can build a Fiat, chassis up, with available parts. If not local, they arrive in 48 to 72 hours. Mopar parts are 30% less from online Mopar stores. For non-critical parts, the Chinese make them for 1/4th the price. (Mexican 500’s are shipped to China. I’m sure the first car off the boat was disassembled and shipped to copy shops.)
This car’s biggest weakness was faulty and misleading trouble codes. One pops up and it’s a week waiting for a diagnosis, to find it’s a software update or some part not associated with the message. I’ve never had a car that will warn you if a light bulb is toast, or when a spark plug misfires. I might learn to love those codes.
The Renegade is another matter. I’d wait until they’ve been on the market 4 years. The good news is there are no surprises… bad news is there are more codes than average in their class. Fiat makes fixes at the assembly shop, instead of ignoring.