If you really want to see the future of Scala look at ZIO (http://zio.dev)

By far the most interesting library I've seen on any platform in decades. It handles the most complex concurrency issues with ease. In my current project is has meant an order of magnitude less code to write. And the way you explicitly have to list what your function returns under every situation e.g. success and error is a real improvement in how Java/Scala works e.g. https://zio.dev/docs/datatypes/datatypes_io

And for web developer look at Slinky one of the nicest React implementations on any platform (https://slinky.dev)

Heather Miller's recent talk at JuliaConf kind of pointed out a couple of issues.