"Lisp was created to make it possible to solve ... problems so complex that holding back any power from users would have rendered the result useless. The designers of Lisp went all in to provide the best tool set they could imagine for solving the most complex problems they could imagine, and mostly managed to leave egos on the shelf while doing so. The reason it isn't changing much is because it's a masters tool set, forged from an ocean of experience; the types of software people build in Lisp change at least as fast as the rest of the world."

I'm a very long time and continuing lisper, but every assertion above seems to me either false, so grossly overstated as to be effectively false, or true of many other languages, and therefore not interesting qua lisp.

The statement is false in the sense that the designers actually realized that the problem space is vast, and impossible to target all of it with dedicated tool sets. So they provided not a tool set but a tool making factory. And not even the final tool-making factory: rather one which teaches something more important: a very good general pattern for designing tool-making factories.

Care to give a few examples of these other languages in modern use that leave as much power to the user as Lisp?

Since I said "...or..." all I need to do is show a language that has any of the asserted properties, not the one you happen to have chosen. Take, for example, "forged from an ocean of experience", and tell me that C++, Java, GO, ... aren't "forged from an ocean of experience". (Note that I'm an ardent and very long time lisper; I would love all this lisp aggrandization to be true. It's just not.)