Soup shot is an informal name used for lighter-bodied, longer espresso-style preparations. CoffeeBox contrasts the idea with a small, thick espresso, focusing on a larger beverage from a similar coffee dose. The name does not establish a universally agreed recipe, a new quality standard or evidence that this style has replaced conventional espresso.
Beverage strength and extraction are different concepts. More liquid can reduce concentration while also changing how much material is extracted, depending on grind, flow and the machine. Extending a shot is therefore not the same experiment as adding water after brewing. Record which method you use rather than treating all lighter cups as equivalent.
Start with a coffee and machine you know, measure dose and yield, and adjust within the equipment's intended operating range. Compare sweetness, acidity, bitterness and texture with a shorter version. A floral coffee may become easier to examine for some drinkers, while others prefer the denser preparation. The useful result is another repeatable choice, not a claim that thinness itself proves better flavour.
The conversation
A good question can make a better brew.