I think the reason the OP's comments got me riled up is that it's the 'what does it matter when it saves time and money' kind of attitude1 that can make working in these 2% situations very difficult. I think what I really wanted to communicate is that you can not always assume 'it works' is good enough. If your working environment has standards set higher than that, you're quite likely to be contracted to work to them, not under them, and you are obliged to do so.
I suspect it's residual bitterness from having to spend late nights at work double-checking data sheets against data inputs (that have already been checked twice yet still have 5% error rates). Eventually I did most of the key-punch work myself because I had the fastest data entry speed with the lowest error rate. People look at you like you're doing voodoo when you can do data entry on the keypad without using the mouse to navigate cells or look at the screen.
1 I'm not belittling his opinion. In situations where you've got to ship the product on a deadline, you've got to do what you've got to do and it is the right way to be thinking. I'm just putting up the counter PoV.