The underlying technology could have other uses. If, as it appears, it uses replicator technology to materialize armour onto the hull, surely it could be used to instantly repair hull breaches by replacing entire bulkheads in a flash?
Sure, that could be useful. But as I tried to get across with my comparison with the Defiant
's ablative armor, the problem is with the specific execution. There are ways that something with certain similarities could be done plausibly and well, but this was not.
Or is it maybe holographic armour and not "real" at all?
Which would make it just a forcefield disguised to look like solid matter, so why not just make it a forcefield?