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you are a man of science
If you're a man of science, you'll be aware of the law of thermodynamics which states that there's no such thing as a free lunch. If nail driving is governed by energy, then it takes the same input to get the same result regardless of how you trade mass for velocity. That's not even the point though, the simple fact is that you can make a steel hammer the same mass as those Ti hammers if you want to. If user experience is different, it's not the mass, it's the detail of the coupling. Since Ti is much less stiff than steel, the impulse will be spread over a longer time, reducing the peak shock load.
gbj_tester
That's exactly why titanium head hammers have a place. Try swinging a heavy mass all day long. As you are a man of science you'll understand the impact on the nail is govern by two factors .. mass and velocity^2 .. Kinetic energy. So speed the velocity up and the mass can decrease = less fatigue.