I would definitely trim like 20% off scala, but I think slow compile times were the main reason. To a much lesser degree but sbt being one of the first things you deal with when learning the language didn't help.

If you put a gun to my head and tell me you can't write in kotlin, you must choose either Java or Scala - for a small project I think I choose modern Java. If you tell me I need to choose for a large cross team and mission critical project - I think I take the bullet.

Still, I have a soft spot in my heart for scala, learned a lot from it.