The square is the most difficult.

Hi! It is actually not suprising and I have had the same observation, people with plenty of easy aspects in their charts who at the same time lack the challenging ones often have a life path with things coming their way easily. That might, for some, contribute to being self-absorbed and show as lack of empathy, because one cannot understand struggle and be compassionate without a significant experience of struggle and pain of their own (a person with plenty of squares will not necessarily be very compassionate, but there is a potential for becoming one, with a lifetime that inspires others). Sometimes through the lack of tension, the people with almost nothing but easy aspects are comfortable in a lifestyle with little ambition, but often, I see these people easily achieving success. Nothing wrong with it, except for the times when I see them going into mentoring positions, for obvious reasons.

I don't think chart aspects explicitly show life circumstances or upbringing in the way that people think. It gives us a clue about how the native perceives things, the style of their behavior, and main areas of their focus (struggle could be financial, lack of emotional support, etc). But even knowing the "struggle" still doesn't show the severity of the issues. What you speak of is probably more influenced by socioeconomic status and culture. Edit: imagine 2 people have the same exact chart, but one is born affluent and the other objectively impoverished. Again, they might have the same nature of reactions and same type of life issues, but the issues will transpire differently and the native's responses will look different even if they share the same personality traits (ambition vs. self-absorption vs. grit, etc).

I can agree, but I have this aspect natally myself, as well as my partner; and with a double whammy in our synastry, this aspect is eccentric for sure, especially within physical actions and decisions. It creates hesitation and confusion because another's eccentric approaches are not fully understood yet. I believe if there is no mature connection and lack of personal emotional intelligence, irritation, as you mentioned, will amplify and linger like nasty chili farts reminding you of their immaturity and lack of consideration.