The best analogy we can make is with marriage: a union between the two influences, and we get both the good and the bad of that union.
This aspect has a unique power: ambiguity.
Some conjunctions are famous for being beneficial and others for being harmful, and while that is often true, conjunctions bring both the good and the bad of the exchange between the parties involved.
The greater the number of points involved in the conjunction, the harder it is to interpret, and the more open it becomes to wild speculation about the possible effects of the influence.
It is very easy to be wrong about the possible effects of a conjunction using the method of analogy alone.