UI stylesheet BEM

Unity Engine
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Using the new UI system, its allegedly possible to use Block Element Modifier (BEM) standards to improve performance and to ease programming (see Unity - Manual: Best practices for USS). Nevertheless, BEM in web development uses BEM nester style classes in css scripts (for example:

.fruit{ 
// some styles
   &__apple{
   // styles for apple
   }
   &__banana{
  // styles for banana
   }
   &--inactive{
   // styles when inactive
   }
}

USS stylesheet does not compile nested BEM classes. This makes the BEM almost irrelevant, as it forces to use large, complex and cumbersome stylesheets.