I disagree. Depending on the soil composition, this could be a sure-fire way to overwater your plants, which will kill them a lot quicker than underwatering would.
You should not water on a set schedule, since plants will uptake water at different amounts, depending on many things including: soil, temps, air flow, stage of growth, size, lighting etc.
The best way to tell when a plant is in need of watering is by the weight of the pots. Watered soil is a lot heavier than dry soil, and when you get used to the weight difference, you will have a reliable indicator for watering.
Until you get used to the weight method, the best way is to either use a moisture meter in the soil, or stick your fingers down a few inches into the soil to feel for moisture content there. The very top layer of soil is not a reliable indicator, since it will dry out quickly due to fans and lights, whilst the bulk of the soil is still very moist.
As for watering technique, it's best to water slowly and evenly, until there is a small amount of run-off from the drainage holes. After this, the soil should be allowed to dry out properly, before you consider watering again.
I personally use nutes almost every watering (using biobizz, which is quite mild compared to some nutes) , but not until the nutes in the soil have been exhausted (check the bag, it should say something like "feeds for xx weeks"). I use plain water like 1 out of 4 waterings, and nutes for the rest of the time.
