[lefstathiou]

I believe it is worth considering also that there is an extremely strong survivorship bias taking place with these works in particular. The works of Plato, Socrates and Aristotle have survived millennia and while most works can likely be successfully summarized, over enough iterations there are bound to be a few that cannot. Reasonable people can disagree of course and this is all subjective anyway.

[agensaequivocum]

Plato can be summarized to and extent. Aristotle, however, is so concise in his language that there isn't much that could be removed. His conclusions can be summarized but one would not understand why he said what he said.