I guess they do eat it though, and then improve the recipe for next time by adjusting what they like. More like an AI approach in that case :D

At least they are 'dogfooding' it and not just letting others eat it I hope :)

When I'm cooking food that I'm going to eat myself I try to limit tasting. If I taste a lot I'm likely to end up with sensory satiation and won't enjoy the meal much by the time I sit down at the table. Just smelling the food while I'm cooking it can trigger this for some dishes (typically curries and other similarly pungent dishes).

If I'm cooking a dish that I've cooked at least three or so times before I generally have a good idea of how things should be going and I can get away with only tasting once or twice at the end.