Seems to me they slapped HFR on it just to make you think you are getting something different to the 2012 version and get you in seats.
Yeah: I'm one of those folks with Motion Smoothing On on my expensive TV. 24fps is a remnant. A slideshow. You're conditioned to like it from having seen it for years, but it's not in any way special. Let. It. Die.
In my opinion, it would be great to see select scenes in HFR such as the famous docking scene from Interstellar. I don't feel there are any scenes that warranted HFR in Titanic and was curious to see what they would have chosen. Surprisingly very few scenes were added in HFR and the moments that were in HFR were very brief.
The HDR is pretty nice but I think the main appeal of this release is to allow a new generation to see it in theaters and the 25th anniversary is just an excuse to allow this. Keep in mind that it is a limited release that I hear will end in a week or so.