Sure, you could go with a standard soil composition and add water on a schedule, then harvest when it feels best.
Or, you think of it as a system with inputs and outputs. If you can observe the system and manipulate the variables (soil composition analysis, moisture measurements, temperature control and sunlight optimization, etc) accordingly, then your yield can improve dramatically.
Any nursery sells a multitude of tools to measure and manipulate those variables, and farms are a whole other beast of systems design.
It's much the same with cooking meat. Control the variables, improve the result.