Recent - Inside DC commentary on the matter....
https://x.com/jdawsey1/status/1988646742737449435
In some coverage about this (either the crash or the recent Congressional testimony about eliminating them) there was a note that at some point (either recently or in the past) IAD had said that they needed to keep them b/c there were no feasible alternatives. Uh, what? I know they gotta ship int’ls over to the main terminal for immigration etc, but it wouldn’t be the first time an international airport would have to deal with such a situation of keeping arriving int'l pax "separate" from others until after immigration/customs. No feasible alternatives?