A modern programming language that makes developers happier.

kotlinlang

As I am a professional .NET developer, I'm wondering if JavaFX is still actively used in the industry? It seems nice (especially TornadoFX with Kotlin), but Java in general is not my main thing

Yes. It's a niche, cross-platform desktop development, but it can help a customer maintain portability across platforms.  I do some C# and would stay in .NET if Windows were my only target platform.  I'm not sure how JavaFX stacks up next to Mono because I haven't had anyone call me to use it.

IMHO, it has the potential to be "bigger", not in relation to webapps which have a deployment advantage.  I think separating it out into a standalone project will help its adoption.