The number of hits you get on the Astral Window spellcasting test will determine how much raw information you get and how detailed it is. It's kind of like the number of hits will determine the resolution of a photograph; lots of hits are sharp and accurate while few hits are blurry and full of static. The number of hits might also play into an opposed test of some kind if for example another mage were somehow trying to stop you. (In this case it would be quite difficult since the spell is specifically designed to penetrate mana barriers).
The Perception roll is used to "determine what a character notices about her surroundings that is abnormal or strange". It's an Intuition-based skill, which makes sense since a character's Intuition would give them the mental acuity to recognize important and relevant information.
Similarly, Assensing "the skill of learning information from auras, astral forms, and astral signatures".
What this all means that even if given all the best information, an unskilled person might draw the wrong conclusions from it.
In this case, I won't make you roll Perception and we can use the Astral Window roll, but I'd still like for you to roll Assensing if you're interested in learning anything about the figure in the room besides the fact that it's metahuman-shaped and appears to be alive (and eating dinner).
I'll modify the previous post so you see what I was going to have you roll Perception to see.
