To prepare the way for the next lifeform used to create the next material that is needed. There was the era of mollusks that gave us limestone, the era of humans produced lots of glass and refined metals. The next era of the roach will probably generate a fertilizer for the cordyceps phase.
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Check this out. One of my favorite George Carlin bits
https://www.goodreads.com/quotes/251836-we-re-so-self-important-everybody-s-going-to-save-something-now-save
Glass, refined metals? - Nope. Plastic
Ha now I remember that Carlin bit, one of the best stand up comedians ever.