I've heard different interpretations on a particular aspect of the chart
This is a normal challenge of interpretation: all the astrologer has to go on is the chart. The missing part of the interpretation is what the person themselves has decided to do with the energy. Let's take your example:
Sun focused in the 4th house
Sun (self-expression) focused in the 4th house (home)
Now what does this mean? It could mean someone uses their home to express themselves (i.e., "You love your home"). It could also mean someone wants their home to be a place where they can "show off" in expressing themself (i.e., "You have a large (grand, elaborate, fancy) home". It could also mean that your home affects your self-expression so renting a dirty, old, crumbling apartment could cause you to feel "cut off" from your ability to express yourself.
That is why the best a Western astrologer can do without further information from the person whose chart it is make a "best guess" at how the interpretation works in the person's real world. And, unfortunately, if the astrologer doesn't get input from the person during their meeting, the astrologer can say all sorts of wild things that don't have anything to do with the person in front of them.