There is nothing but frustration at Scala's stagnancy driving.
I'm not defending how obnoxious it CAN be to write Scala, but say it's stagnant is just dishonest or misinformed. Or both.
Also SBT. Fuck sbt.
It's difficult to point to a more poorly managed language project than Scala. The net result is a mess with tons of gotchas, performance pitfalls, technical debt and a 3-way split tie in the community.
Scala has driven away a lot of brilliant people.