Empathy is worthless for understanding people Empathy has to do with the ability the human mind to project itself into other people or other situations. If it wasn't for that capacity of the mind only the
solipsistic approach would be valid. That approach makes you a totally egoistic person and you tend to believe that your experience in life it's unique because only experience it, when in fact the same situations have been repeated millions of times in history by other people. If not psychology wouldn't exist. Perhaps our existence is not that particular and special but our egos want to believe it is!
Empathy is not perfect because we cannot actually hack into other's people minds and fully project our consciousness into their minds an know exactly what they feel and think otherwise the world would be like a hive-mind in which the self and even death were known and accepted as illusions.
Yes, as humans we have limited capacity for empathy nevertheless it's our natural defects what makes us humans. In French and Spanish this is called
Grégarisme (I don't know why it's hard to find the same term in English) that says that humans are beings between totally "
gregarian" species such as bees or chimpanzees and totally independent or asocial ones such us some spiders and leopards.
Buddhism and Vedanta are some of those philosophies that aim for that "hive mind" that is called "Universe". In the first one it is said that all sentient beings want to be free of suffering. Besides they experience ignorance and impermanence too. The idea of free-will is debatable. When you accept that you get compassion and true understanding of existence not just for people but for every living creature.
The question of "who am i?" makes you do that philosophical trip from solipsism to a total non-ego experience. Empathy is just an stage.