A little known secret: dealer mechanics are some of the worst hacks out there! Most of them work on flat rates and have plenty of jobs in line. That causes them to find shirtcuts and get really good at fixing cars FAST!
DSM timing belt is very tricky to do, most "normal machanics" screw it up. So dealer is better but they tent to skip certain steps. So I am not surprised when I hear about their failures.
But after mid 90's (after they went through couple of timing belt versions), timing belt hasn't been an issue.
96 Eclipse Spyder GSX (already turbo, AWD swap)
93 Eagle Summit AWD (4G63 turbo swaps)