No, the Engineer does not see the glass as being twice as big as it needs to be. The Manager might think that way, but the Engineer knows better.
As a for instance, the Brooklyn Bridge has a safety factor of over 3.5. And that's true even though a subcontractor delivered a load of inferior steel cable, because the engineer had designed it with a safety factor of 6.
It's why the nuclear plant in Onagawa, Japan, came through the March 2011 earthquake and tsunami with a flooded basement and an efficient shutdown even though it was 68 miles closer to the epicenter.
Engineers LOVE safety factors.
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