Take almost any book on the list of the OP, read it with a friend, and you will probably disagree completely on at least a couple of the points made, or how they should be interpreted.
This is a thoroughly modern perspective. Historically, Aristotle was considered "The Philosopher". Plato has staged a resurgence in the discourse (in fact I'm partial to Plato myself), but you're over-stating his historical impact. Which is sort of ironic, when you're discussing historical impact.
Further Marx predicted that the first nations to fall to communism would be the most capitalist ones, but in fact the opposite occurred and the least capitalist countries fell to communism, meanwhile the capitalist countries have not.
That's just one example there are plenty of other others that can be provided, from how is theory of dialectical materialism was wrong on all counts when it came to any scientific power, to history.
In fact the most impressive part of Marx is how truly wrong he managed to be without actually being original as the majority of his work is derivative from Hiegel.
I wish I could better understand dialectic materialism in order to critique it. I can't get around not having a noetic reality that serves like chaotic attractors to materials. Spheres and triangles are just more real than material manifestations. Penrose and Popper proposed similar tripartite realities of, roughly, the material, the conscious and the mathematical.
But Plato doesn't lay out "the truth." He presents beautiful dialogues that allows the reader to consider, agree, disagree or digress. Try reading the Parmenides. Here, the impossibility of unity is presented alongside the impossibility of difference. It shows the limits of language and maybe thought— or read the symposium for radical ideas about the nature of love.
Or, hell, read Xenophon's Socratic dialogues. He was more radical than Plato, though they were both students of Socrates. Xenophon turned into a mercenary and defeated the king of Persia. Then wrote extremely practical dialogues about getting rich.
Philosophy isn't about truth. It's about the love of wisdom and, ultimately, wisdom is about living a better life. Philosophy includes material that cannot be expressed with words.
Finally, Pythagoras—who coined the word philosophy. He wrote nothing out of principle and yet his worldview is arguably the most transformatively modern. Newton, Copernicus, Kepler and Gallelio all credited Pythagoras for their findings. He seemed to believe that the world was made of math and that the natural harmonies of mathematics would manifest in the harmonies of the cosmos. This idea is still resonant in the sciences — like in the groundbreaking discovery of harmonic peaks in the cosmic microwave background radiation. Pythagoreans conducted the first empirical test of a mathematical hypothesis (that bronze chimes in ratios of 1:2 and 2:3 would sound consonant).
When you read about groundbreaking wisdom that is over 2000 years old, it gives perspective on how we might build a society that similarly endures.