Many people could talk for days about this. One of the biggest issues for me is the lack of Referential Transparency. You can perform arbitrary effects (IO, mutating global state) whereever you want, and the language doesn't try to stop you. Exceptions, nulls, brittle compiler...
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The reason it has this type of interop is Scala is a multi-paradigm language, it only makes sense to do an Eta style interop in a purely functional language. Scala's interop story is similar to F# and Clojure. So shitting on Scala for this is just trolling.
No. Eta's interop was motivated and designed specifically because of how bad Scala is. It has nothing to do with multi-paradigm or not. Scala's interop has been known to be terrible, by many, for at least a decade. "So blah blah is just trolling." Give me a break please.