Aspects are the most poorly understood aspect of Vedic schools of astrology. Even “Vedic astrologers” seldom know what Vedic aspects really are. It is a real shame. The beauty of Vedic astrology is that its ancient form is still largely intact. This gives us access to the way global astrology was practiced centuries and millennia in the past. Thus you can trace most techniques or principles of any school of astrology to a Vedic origin.
Most people think that Western Aspects deal with orbs and exact degrees. The truth is that Vedic Aspects also deal with orbs and exact degrees, as you have just learned, and have done so potentially for thousands of years since Sage Parashara wrote the Brihat Parashara Hora Shastra during the time of Maharaja Yuddishthira, roughly 5,000 years ago.
There is a Western Aspect theory that applying aspects (those less than their exact focal point, but getting closer to it) are more intense while separating aspects (those separating from their focal point and moving past it) quickly dissolve. Look at the basic chart for Vedic aspects to the most fundamental point, 180º away. You will see that the effects are far more intense as the aspecting planet applies to (approaches) the aspected planet, and once the focal point of 180º is reached the intensity of the aspect quickly falls off. This is because as the aspecting planet approaches the aspected planet stands in its eighth house and gradually moves into the seventh. After being exactly opposite in the seventh house it moves towards the sixth. Follow the graph for from the eighth house (210º) through the sixth house (150º) and you will see that it is an exact description of applying and separating aspects.
In Western Aspects trines are thought of as mild and beneficial influences. This is because in ancient astrology planets mildly aspected the trines (fifth house / 120º & ninth house / 240º), except for the beneficial Jupiter who aspected these points at full strength.
Squares are considered to be rigid, strengthening, but rough aspects in Western Theory. This comes from ancient astrology in which rigid and rough Saturn is the only planet who fully aspects the tenth house (the 270º square), and strong but rough Mars is the only planet who fully aspects the fourth house (the 90º square).
When you use real Vedic aspects, the aspects that calculate exact degrees, there is no need to wonder if you should also use Western aspects. You already are, because vedic degree aspects are the mother of Western aspects. The only unfortunate thing is that vedic software does not yet offer as appealing and intuitive an interface to depicting aspect patterns on charts.