Vehicles comes with a warranty from Dodge. But the weird thing is, the Thermostat isnt covered. Again its only a half hour job plus the bleeding. But no I agree with you on the poor designs. But the highest point in any cooling system should have a bleed valve. In this 3.6 there is a bleed valve on the thermostat housing. But would also need the front end elevated and the bleeder cracked.Probably can get a "Pancake" air compressor from Harbor Freight fairly cheap that will do the job.
I'm sure other Auto manufacturers have "Poor" designs for some of their engines too. It's not just Chrysler/Dodge/Jeep.
It's not like the "tools" cost thousands of dollars where only dealers can afford to have them. Did you check all the fluids including the coolant before you bought the vehicle? If not...it's on you. And it's an 8 year old vehicle bought used. Good luck with whatever path you take.