There's also a bit of a safety factor with those. You can get bumped and a plastic straw won't break a tooth or stab through you as easily as a steel straw will if you were to fall. There was a case of a woman who had died form a steel straw going into her when she fell. Sure it wouldn't be a common thing, but those freak accidents stick in my mind.
I have some silicone straws instead, flexible, easy to wash, and also easy to carry in my silverware bag on the go if I need one while at work or such.
I think risk assessment is important for all areas of our lives.
I'm required to drive to maintain my job and be able to shop. Bit different from a nice to have like a straw but since the comparison was made let's consider some things with that.
When driving my steel box at 70mph I'm wearing a seat belt, I know that my tires are in good shape, my vehicle has routine maintenance, and I drive defensively with caution. Minimizing risk as able.
A titanium or steel straw that can impale me if I trip while around the house or sipping a drink in a car for example or just get bumped and chip a tooth when there's better alternatives like the silicone straws doesn't make sense to me to use steel or titanium straws when assessing risk between the two.