My personal favourite is Scala too. But its slightly complicated from a beginner's perspective. As you said, concepts are more important. I learnt Scala and when Kotlin came out I was already familiar with 90% of its features.
Java is moving slowly, but hey enterprise companies move a lot slower as well. They don't adapt to newer Java language features as they come out. You can be polyglot if you learn the concepts and with Java/Kotlin/Scala, it is a lot easier since they all target the JVM.
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My personal favourite is Scala too. But its slightly complicated from a beginner's perspective. As you said, concepts are more important. I learnt Scala and when Kotlin came out I was already familiar with 90% of its features.
Java is moving slowly, but hey enterprise companies move a lot slower as well. They don't adapt to newer Java language features as they come out. You can be polyglot if you learn the concepts and with Java/Kotlin/Scala, it is a lot easier since they all target the JVM.