You’re right that they’re the same size but you’re mistaken when you try to assign a total value to the stack. Consider breaking each $100 bill into 100 $1 bills. The value is the same, clearly. So for each pair, you have a $1 bill and a small stack of 100 $1 bills. Now combine all singles back together in an infinite stack. Then combine all stacks of 100 into an infinite stack.
And you know what? Both infinite stacks are identical. They have the same value.
Customers tend to view quality more holistically than that, though. Not a lot of people are going to flip their conception of product quality on a single change, but will after a long series of changes. Once a company gets that reputation for poor quality, it’s not as simple as reversing the last corner they cut. It’s a hole that takes a lot of changes to dig out of. More than most companies are willing to reverse.