You should start your grow with the best soil possible.
You can use good nutes on shit soil but it's still shit soil underneath!
Regular feeding is finding out how OFTEN they need to be fed to maximize growth without burning.
I look at it as 'once every x number of waterings' instead of 'x number of times a week' since the plants may use water at different rates if your temps, ambient humidity, light intensity, size of plants, etc changes over time.
ORganic soil plus organic tea is also of course a perfectly acceptable plan!