Yeah, there's been a lot of major in-depth sleuthing going on with the Titanic lore.
Some people claim to have figured out what REALLY happened, but WHY is still unknown.
A lot of it does make sense though.
As for ice vs metal...........
Hard packed ice CAN damage metal. It can act like a can opener. And ocean water is not the same as tap water.
After hearing so many stories, opinions, and theories about the Titanic over the decades..........my personal opinion is that Harland and Wolf over extended themselves building such gigantic ships. They didn't make as much money from them as they thought they were going to, and had to kill one of thier ships off to recoup enough money to stay afloat as it were.