Logic is a convenient tool, and it underpins mathematical reasoning and thus all mechanistic explanations of the universe. This does seem to imply a lack of me

Logic is a convenient tool, and it underpins mathematical reasoning and thus all mechanistic explanations of the universe. This does seem to imply a lack of meaning due to predetermination if we follow Descartes... but that's all fallen down due to all sorts of revelations, including quantum indeterminancy, special and general relativity, and sensitive dependence on initial conditions in the world of physics, and incompleteness (Godel) and undecidability (Church-Turing) in the mathematical world. Mathematics is now like a castle floating in the sky, holding itself up by its own bootstraps, and physics is as much probability as it is predictability. We can go to great efforts to create systems that provide the illusion of predictable, logical behavior (e.g. computers), but cosmic rays still flip bits occasionally. I've adopted this viewpoint as a result: "Deep in the human unconscious is a pervasive need for a logical universe that makes sense. But the real universe is always one step beyond logic." - Frank Herbert, Dune