Scala is great, but the tooling is what ruined it for me. SBT is far from simple, Scala 3 basically reset the IDE suport, the compiler is abysmally slow (if you think Rust compiler is not fast, don't look at Scala which is like order of magnitude worse).

And also the cost of FP is quite high on JVM. Paying 10-20x performance price for functional transformation chains over similar ones in Rust is a bit too much for me.