If anyone says they don't curse while quilting or sewing they are lying to themselves and others. Been there done that over and over.
My husband is a machinist and I have had to listen to his talk of work for 34 years now. I am amazed that something like iron, stainless steel or any other metal is as hard to cut accurately etc. as our fabric. Little things like temperture and humidity actually make a difference when cutting metals. They actually use "dry ice" and an ice chest to transport pieces of metal the length of the shop building so that it will not change size before they can do their cutting. My husband says it is standard procedure to use ice or heat to make two parts fit together as it is almost impossible to cut them precisely to make a perfect fit.
If "metal" is that unstable how can we expect fabric to not be impacted by similar conditions. Why do you think we try tricks like starching our fabric before cutting etc. etc. If metals were as unstable as our fabric there would be no way to make things out of that material. While I am very proud of my handquilting I will admit that after more than 40 years of sewing and quilting my piecing and seams in general will never be perfect.