I really like how tools that are initially narrow in scope get hyped and start being used where they are completely unsuitable. I call this the "grandmother principle." My grandmother, as soon as she saw some useful property in a medicine or food, would start extrapolating it to everything. For example, if onions helped her once with a cold, then a couple of years later they were recommended to all relatives for boosting tone, improving vision, lowering blood pressure, and in general, you could have nothing else in life, the main thing is to eat onions in the morning.

This happens everywhere, especially in startups, because it's unclear. As soon as a tool shows results, it starts being shoved everywhere. So if you receive a persistent recommendation for widespread use of a tool, it's best to stop and realize where it was originally used and whether its applicability is really that broad?

Here's an example. Unit economics is initially a tool used strictly for evaluating business scaling. To make sure before pouring in big money that the product sale is profitable and we won't go broke when scaling. Now, after some hype, the unit economics formula already replaces economic models, they build development hypotheses and calculate the sustainability of corporations, predict dollar exchange rates, and in general, it's the best tool after onions.