What exactly is "all-ponies-and-rainbows" about this sentence: "One of the main problems in gauge theory is understanding the geometry of the space of solution

What exactly is "all-ponies-and-rainbows" about this sentence: "One of the main problems in gauge theory is understanding the geometry of the space of solutions of the Yang–Mills equations on a Riemannian manifold." The author is not proposing to write wordy prose. He is proposing to write understandable prose instead of incomprehensible pages of equations.