Wouldn't they need to be compiled first ?

For the build to not get cluttered?

Actually it looks like you can apply kotlin scripts..https://github.com/gradle/kotlin-dsl-samples/issues/497

But I would still use buildSrc

Another thing why doesn't my build script get gradle.properties values?

i have this property kotlinVersion=1.3.50

then I want to use it in the plugins scope

kotlin("jvm") version "$kotlinVersion"

gradle doesn't find the property

Ok I found out thanks