Quick. Explain it holding the highest (2D) home release sales for 5 years, before being slightly edged out by Frozen?
I can't. I'm just describing it's relevance to the cultural Zeitgeist as I perceive it. If I'm wrong, I guess I'm living in a different world to you ¯\_(ツ)_/¯
Is this your claim to any number one film for it's time then? I can remember bits and pieces of Titanic at this point. That's it. Doesn't mean I'm by any means part of the majority on that. Endgame is a big deal cultural event too. Anything rocketing to, or close to number one is. Doesn't mean it doesn't resonate. People don't go back to see a thing more than once if it doesn't resonate.
Everyone loved Titanic. People talk about that movie fondly. Hey, anecdotal etc, but in my personal experience Avatar gets treated like the Simpsons movie: "oh yeah, I guess I saw that." People are only talking about it now because of the record, and don't @ me, but tbpfh, until now, my friends and I all thought Titanic still held it.
Movies that are cultural events can be beloved. I believe Endgame already is. Avatar just...isn't. It never was.