My teeth make pretty good retainers. It seems like a weird nostalgia thing. There must be far more pop consumed in a bottle than in a fast food cup, and I've never seen anyone put a straw in a bottle (except on tv).
I was recently served a long macaroni as a straw in a restaurant. It was honestly amazing how well it worked! At no point it was mushy and there's nothing in it that I wouldn't eat with my pasta dish anyway.
Despite very limited usage, metal straws have caused major injuries including fatalities. Turns out having a metal stick pointed at all sorts of sensitive soft tissue is a risk.
Meanwhile, if using your own straw with a restaurants disposable cup, hardly helps since the cup is still being waste. If using it with reusable cups, it won't save you from any sanitation issues, since the drink is right in contact with the container. It may be useful for sanitation reasons with a can, but again, the can is disposable. Even if you recycle it, the coating on the inside and the paint on the outside probably are about as much as the plastic straw you spared.
Well, no, just I'm personally apprehensive. I can't find a story about someone getting killed while using a fork, I can find that about metal straws. I'd personally favor just drinking straight from a cup with my mouth, or a reusable flexible straw if the beverage were something like a milkshake.
Don't forget about reporting bias. You're more likely to find stories about Metal straw deaths because metal straws are not common. So when it does happen it's considered news, just like how you're going to see reports about almost every single EV fire and yet hundreds of cars Catch Fire every day and you almost never hear about that. Hell you've probably driven by a standard gasoline engine fire more than once in your life and thought very little of it