Looking through the internet and especially at Gospel piano tutorials you often find the term “Phat” chords. These “Phat” chords are basically extremely extended and altered chords using both hands creating that deeper sound. It may sound awesome as first due to the complexity. However just because something is complex it does not necessarily mean that is it good. Over extending chords often makes it difficult to identify the correct key or keys used. Over over extending can be a sign of not really knowing the theory behind getting nice harmonic tension in chords.
Check out Robert Glasper, deep Neo Soul / Jazz with a lot of harmonic tension within his chords textures however I do not see over extended “Phat” chords being played, no need. He is skillful enough to be able to identify what keys “at a minimum” are need to setup tension between chords, and this is the most important thing. Try watching his hands next time and see for yourself, he is playing a lot of 7th major and minor chords. It is the way the chords are strung together which makes it sound so special.
These so called “Phat” chords do sound nice, and are good in church as long as the singer is familiar with the progressions, however they are not always required for theory.
A very good example is below, have a look at how the roots of the chords (mainly 3rd and 7th) are targeted in this Autumn leaves improvised piece.