What went wrong??

Look at the wages and benefits that the UAW gets and then ask the same question.
As far as limited options go, imagine that if they sell only 1 Sebring with a manual trans, they have to run a 50,000 (maybe 100,000 mile) mile EPA test on it.
Look at just how many different wiring harness combos there are for each vehicle. A/C, radios, power windows, locks,etc.