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You might say he's a power fantasy because he has so many strengths, but Thanos is physically imposing partially BECAUSE he's intelligent. He used his knowledge of science to biologically and cybernetically enhance his own strength, durability, and powers. This isn't explicitly stated in the movie, but given his work on Gamora and Nebula, it's highly likely this is still the case in the MCU. If you're going to have Thanos be a truly intelligent character, it stands to reason that he's still going to shore up any possible weakness, and give himself every possible advantage.
