We have so many different types of vegetables, with academic root depths ranging from 3-6 feet to only 4 inches. Different plants have different desires for wetness, some are just germinating while others are fully developed, etc.
Makes it impossible to get the canonical correct settings by measurement, so I set the root depth to a middle value, faithfully entered all my soil properties, and modulate AD/Kc, run manually, and water by hand based on frequent observation of crop health & soil moisture. In future years I plan on addressing variation in crop need with emitter design & bed groupings.
It has by no means been maintenance-free, but hopefully in the end once I settle on empirical settings it will work well.
Total water usage in the garden is a rounding error compared to our tree & bluegrass usage, so for the garden I'm really more interested in plant health and rain skip than perfect efficiency.
Tomatoes, FWIW, despite their reputation as water-hungry have extremely deep roots and need to dry out between waterings. They don't like swamps. We nearly killed one this year by overwatering with the hose.