Yes, but there's far less difference when compared with the fire hazard power adapters that Apple stonewalled on and had to be hit with class actions over in the past.
One example is the more recent settlement over frayed MagSafe connectors that took two years with Apple resisting in court.
Before that, there was the 2008 multi-hundred million dollar settlement over up to 2.3 million iBook and PowerBook adapters that had sparked and melted wires since 2001. Apple finally settled while still refusing to admit fault.
Since the actual failure rate so far has only been 24 per million, then the chances of seeing a problem during a multi-week test would've been less than one in 40,000.
So even if they had used a thousand test units in the field for a much longer time, the chances were very good that none would've exhibited the problem.
Likewise, Apple is known for last minute changes, and has pushed units out even if there's a problem.
Remember back when Foxconn quality control workers rebelled over the standards they were supposed to meet with the iPhone 5, without training and without equipment to prevent damage to the finish?
Millions of iPhones with defects were sent out and sold anyway, and later had to be returned (because of being swapped by owners for better units) to Foxconn to be fixed.