Watercat, hydroponics has been researched heavily for years. We know there are very specific
nutrients at specific levels needed for improved plant growth. If I'm going to simply make a compost, I might as well stick with soil, because that same level of uncertainty regarding the nutrients the plants are getting remains the same. Of course compost can provide nutrients, but it is nearly impossible to ensure the correct balance for optimum feeding.
Besides, my compost always comes out a lumpy mess even after I spent the bucks for a tumbler.
You are fortunate that you are a successful gardener. I am quite the opposite. I am the plant killer. Using established nutrients on an established schedule gives me the advantage I need to get the job done.