Why not install a filter to prevent choking on food?

Because it's far easier and cheaper to teach people to chew properly. I can't imagine it would be comfortable having a filter lodged in your throat either.

What, do you mean in your windpipe?

I think it's called Soylent, if that's still around. Hard to choke on liquefied food.

Is this a joke question?

I prefer taking the risk of dying.