Controversial take. #biodegradability is only a value in a disposable, use once and throw away style economy. It is an attempt to make utterly unsustainable consumer capitalism of disposables kinda work to keep producing things that break to be thrown away over and over.
Indestructible things designed to last, with NO end-of-life don't need to be biodegradable. Things that you would pass to your children.
In "Hyperion" there were ancient pieces of electronics that obviously worked. That's what we should be doing.