It's not uncommon for White Bear to offer a lifetime/unlimited miles powertrain warranty for their vehicles, but I've haven't read the fine print for mine. Wheel bearings & starter wouldn't fall under a power train warranty. Owners may have paid extra for more warranty coverage, too?
I had the same thought as you about all that. Regardless, the 414,000 mile Mirage is a good example of the durability of these small cars. I had my reservations at the time of purchase. The fleet of cars Fummins was taking care of eased my mine at the time, & that's still the case almost 4 years later now.