I wanna talk about ORAS there; when people were talking about "HoEnN rEmAkEs CoNfIrMeD" all those years ago, they were hoping for/expecting an Emerald remake, or at least for the remakes to take elements from Emerald - like what HGSS did. In those remakes, yeah the main Legendaries are Ho-Oh/Lugia, but it still incorporated the Eusine and Suicune plotline, Buena's radio show, the secret Unown messages, the Dragon Den quiz, and expanded on Crystal's Battle Tower (by copy/pasting Sinnoh's Battle Frontier, but still a goddamn Battle Frontier).
Compared to this, ORAS had...pretty much nothing from Emerald. It had fewer Trick Master puzzles than RS (6, compared to 8); it only worked in Rayquaza by shoehorning in a short postgame plot ("Delta Episode"), instead of managing to tie it into the main story by having Rayquaza calm down the respective titan or something; copied over the awful Battle Maison from XY instead of keeping RS's Tower or bothering to work in Emerald's Battle Frontier; no Gym Leader rematches; no Mirage Tower for the Claw/Root Fossils; no Emerald-exclusive areas like the Desert Underpass or expanded Safari Zone areas or Terra/Marine Cave; Team Magma's hideout is still in waterfront Lilycove instead of the volcanic Jagged Pass which makes no sense; fewer Trainers in Gyms compared to Emerald; no Trainer Hill.
Also, the Eon Flute was awarded far too late to be useful. Not only is using it and summoning the Lati slower than Fly's animation, but soaring around is a rather slow way to traverse the region; it's only really useful for Mirage spots, and if those are already done or you don't care, the Flute is worthless.
If it was given before you got HM02, then it'd have some use as the only way to 'quickly' get around the western part of Hoenn, but...no, it's given after the entire Groudon/Kyogre fiasco, long after HM02's been available.