What’s the benefit of adding natural language descriptions to models?
Sorry for the delay here, @nico31… 
The short answer: It helps PromptQL understand your domain better, leading to more accurate query plans. You can think of PromptQL attempting to navigate the structure of your related metadata without any context or with context. Like a human, without context it will take a number of iterations to find the right data. This essentially accelerates and short-cuts the experience getting you results faster.