Restaurants already have requirements around those with special needs (including those with babies), requiring them to have a few washable stainless steel straws on hand is not much to ask. Granted, there may be slip-ups, those should be reported.
The problem is that some of the people with limited mobility also have limited ability not to chew on the straw (they can't control their jaws well enough). You chew on a plastic straw, that is not an issue. You bit down on steel...
Those people btw are the ones who most need them, because they typically also have too limited mobility to drink from a cup.
That makes sense. I'm not going to say it should be dismissed due to its relative low incidence, but there has to be a better solution than a straw free for all everywhere.
1) If you have a cognitive disability, remembering to bring a straw may be difficult.
2) If you have a mobility disability, you may struggle to wash the straw in a suitably disinfected manner after use.
3) How do you reuse the straw on the go?
4) This(bringing your own straw) is another cost added onto an already economically overburdened populace.