If we deliver on time, but the product has defects, we have not delivered on time.
In a true zero-defects approach, there are no unimportant items.
Most things don't work like they are supposed to work.
Quality is such an attractive banner that sometimes we think we can get away with just waving it, without doing the hard work necessary to achieve it.
Eliminating what is not wanted or needed is profitable in itself.
If anything is certain, it is that change is certain. The world we are planning for today will not exist in this form tomorrow.