Without lignin, there would be no woody plants, no wood, no coal, no charcoal, no fire, no pottery, and certainly no iron or metallurgy.
Conditions on Earth, the laws of physics, are not only fine-tuned for the survival of intelligent beings, they are fine-tuned for the development of technology.
If the conductivity of copper were ten times less, wires would have to be ten times the cross-sectional area to provide the same conductivity.
It is very doubtful that any beings in the universe could develop a civilization remotely comparable with our own without the use of metals.
As we have seen so far in this series, fire was an absolutely crucial component in humanity’s rise to civilization and technology.