This set of best practices contains some interesting ideas.
The recommendation to avoid the Cake Pattern, combined with a DI suggestion are particularly interesting.
The Cake Pattern is essentially an OO pattern that uses Inheritance for Implementation, which is generally considered an anti-pattern. OO design standards have evolved with experience, recommending composition over inheritance.
The conventional Java interface based DI
trait DBService {
def getAssets: Future[Seq[(AssetConfig, AssetPersistedState)]]
}is replaced by a flat, functional design
f: => Future[Seq[(AssetConfig, AssetPersistedState)]]