Can you ever stop the raiders?

Does upgrading the vault door do anything other than simply slow down (and not by much in my experience) the raiders trying to get into your vault?
I mean I appreciate the delay so the armored and gunned up people can get to the entry way to stop them, but it just seems like that is all it is good for, a bit of time before they will always get in... with their swords.. some how getting through 5-6 feet of steel... Whatever.
Best Answer
Upgrading the vault door to advanced and beyond won't stop raiders from breaking in, but it will give you more time to get your best armed and armored dwellers to the vault to keep them at bay, which can be important if those dwellers are assigned to rooms very deep in the mountain.
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