The end of the United Auto Workers strikes against Ford Motor and Chrysler-parent Stellantis offered some relief in Detroit after a bruising six-week labor showdown. But the car companies aren’t in a celebratory mood.

The details of the UAW’s tentative labor pacts with Ford and Stellantis, reached in recent days, show that the automakers’ labor-cost disadvantage to rivals such as Toyota and Tesla is about to get worse, just as many aspects of their growth plans get cloudier.