Even after 10,000 armchair lawyer discussions about the Google-Oracle lawsuit, I feel like 99% of developers still do not grok that Android's "Java" isn't really Java.

They wrote their own implementation of an earlier version, and at this point will probably never update its API to fully match Java 8 or beyond. Android devs who want advancements will have to add "shims", like retrolambda or (quite frankly) Kotlin.