> The fact that interoperability with Scala 2 as a feature request wasn't accepted means that it's better not to build upon Scala anything with long lasting va

> The fact that interoperability with Scala 2 as a feature request wasn't accepted means that it's better not to build upon Scala anything with long lasting value. You're reading the notes wrong. The Scala 3 WIP version (Dotty) is already compatible with Scala 2 except for macro's, which are a pain point. There is a plan for making Scala 2.14 (next version) forwards-compatible with Scala 3, i.e. that it will be able to use Scala 3 binaries. The vote was whether all efforts should focus on backwards-compatibility and no effort should be put into forward-compatibility or whether forwards-compatibility should remain a point of work.