Bottom feed vs top feed

[AKgramma]

I wonder: what is the advantage of bottom feeding (as in Octopots and hempy) over top watering and leaving the runoff in the catch pan under the pot? My plants eventually suck up the overflow, anyway, so standing water is not an issue.

Over the years I have read a lot about the two, and even tried a hempy grow, with the result of 1/3 smaller plants and less yield.

 

[Blew Hiller]

Maybe it is easier to automate watering trays? I am like you...water till runoff and the pots suck up what they need later.