Why don't substances have a condensation point?
A "condensation point" is sort of a misdirection as to the physical process involved. "Point" is really a stand-in for "temperature."

Consider water in air. Let's say that the temp is 20 degrees C, but the "dew point" is 10 degrees C. So if the temperature drops to 10 degrees C then the air is saturated with water and and a further drop in temperature will result in the formation of dew. So being past the dew point is dependent on the amount of water in the air and the temperature, not just the temperature alone.