My first knowledge of the whole Titanic mythos came from Upstairs Downstairs; there is episode where the character of a Lady’s Maid (Roberts according to Wikipedia) is a Titanic survivor. I remember being deeply affected by the character and plotline…of course, I was under age 8 probably when I saw it.
When the Kate & Leo movie came out, I wasn’t a huge fan. I thought the special effects were good and the costuming was great. But I wasn’t moved by the modern day story and I thought it was OK. (My cousin, of course, has a different opinion.)
So why 100 years later are we still talking about this tragedy? I think it’s the way humanity’s technological hubris crashed completely into Mother Nature and we learned who wins in the end. I think it sits in our collective imaginations as a modern day cautionary tale (like don’t talk to wolves in the forest) to never call anything unsinkable/unbreakable/indestructible. You’re just asking Mother Nature to go after you, if you do.