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[EM41]

Production can be done with zero tolerances but there is always an uncertainty that a specified parameter is actually met.
Totally different and usually misunderstood, one has to do with a parameter over a series of devices, the other with an individual parameter.

[STS-741]

Production can be done with zero tolerances but there is always an uncertainty that a specified parameter is actually met.

This is exactly what we are talking about here, whatever the manufacturing process will be, there will always be tolerances in the end and simply ignoring them is unprofessional and inevitably leads to problems. Of course, you can also produce something without planning any tolerances, but the actual standard is always the end result.