Would you mind terribly enlightening usI don't think its unconventional, It is a proper method.. I think its just not the way folks do it in Cannabis culture...
Most folks don't get top watering right anyways....
The reason watering is not easily taught is because it varies from environment to environment..
The key is to never let the medium completely dry out, but at the same time allowing for fresh air to oxygenate the roots....
When you top feed your plants the water enters through the top and as it falls through the medium it pulls air in with it... When you bottom feed a plant you don't get that effect, but water seldom wicks all the way to the top layer so it allows for air to enter through the top.... switch from a plastic pot to a fabric pot and it all changes, cause air can enter from almost all directions......