Why laser mark?

Some time ago before lasers, the only way to achieve a mark was by physical engraving, letter punching, electro-chemical or acid etching, and various methods of painting. They worked and many of those methods are still in use today however, they each had obstacles to overcome. Some obstacles like contours made it difficult to for paints or letter punching. Although chemical etching would work it was expensive and time consuming to purchase, and then let’s hope it doesn’t rust from the etching solution or neutralizer. The costs, production time, and headache stories go on and on.