I think they got past certain early traversal barriers (blocking kid) and cutscene elements (Deku tree introduction) to move swiftly along with the demo.
The Triforce is only featured very sparse in BotW and TotK, the Triforce appears on Zeldas Hand first when she saves Link, finally awakening her Power. Then again when defeating Ganon. in TotK I don't really remember it showing up like this but Rauru Sonja and Zelda basically form the Triforce.
I haven't played OOT or majoras mask since about 2001 so this is going tk be a familiar but very different experience. I dont remember a lot kf the ga play or where hearts and other containers are.
Edit: You could backflip in the original OOT as well. If you mean the backflips when jumping across the wider platforms in MM I guess we’ll see when it comes out.
Have you guys played The Adventures of Elliot? It's made by Square Enix, but it feels like playing Link to the Past on snes. It's HD-2D. It feels like Square said "well if Nintendo doesn't want to make classic Zelda, we'll do it ourselves."
Ocarina Of Time Is Finally Here! (Full Zelda Direct Reaction!)