Why can I no longer break into doors in Deus Ex?

The Door Strength bar on the doors in Deus Ex doesn't show Hit Points, but a threshold: it shows the minimal damage you need to apply in one go in order to break it down.

This forces you to make strategic choices: do I blow up doors to get an advantage (in the form of items, or shortcuts, or information) alarming everyone to my presence, do I look around for lockpicks, potentially fruitlessly, and sneak in, while increasing the chances of being caught, or do I just bypass the entrance altogether?

I have also on several occasions blasted open a door remotely and waited out the alerted enemies so I could sneak back and enter or steal what's behind the door.