I agree, there's little reason to coat or otherwise treat titanium, other than for a nonstick cooking surface or for decorative purposes. Plain Ti cookware is just that--plain Ti. Interestingly, Ti self-coats:
"This metal forms a passive and protective oxide coating (leading to increased corrosion-resistance) when exposed to elevated temperatures in air, but at room temperatures it resists tarnishing. When it first forms, this protective layer is only 1–2 nm thick but continues to slowly grow; reaching a thickness of 25 nm in four years."