Without lignin, there would be no woody plants, no wood, no coal, no charcoal, no fire, no pottery, and certainly no iron or metallurgy.
There is another aspect of the Earth’s environment that is absolutely crucial in allowing the utilization of fire for metal-based technologies.
All these elements of fitness in nature for the development of technology, crucial to mankind’s rise to civilization, long preceded man’s arrival on Earth.
The combustion of wood or coal may seem so familiar as to be unworthy of any comment.
The ability to tame fire led to the invention of the art of cooking, and much more.