[clay_to_n]

It would be awesome. There are some polyfilling libraries, like Retrolambda for lambdas, and ones to get streams etc already, without actually using Java 8.

Jack broke a lot of things on Android (like some annotation libraries, which the article mentions), so I think the wider Android community will be happy there's a clear path forward to Java 8.

[canistr]

Enabling Jack also prevented the ability for devs to use Instant Run. It's not a dealbreaker, but combined with all the other broken libraries it definitely added to the frustration with needing/wanting to upgrade to Java 8. I never found it worth upgrading and almost always ignored sample code that showed Jack/Java8 in the gradle files because they didn't seem to be based on real-world usage.