[conductr]

Perhaps difficulty escaping from interior.

[munk-a]

In Canada at least it's because fire-fighters aren't trained to bypass them and, as you said, concerns about people within being unable to escape.

[hnbad]

FWIW in Germany there's a requirement for buildings with automatic shutters to have one designated emergency exit window where the shutters can be operated manually. But fire-fighters shouldn't really have much of a problem if they carry an axe.