In hindsight there is so many things that Remake does wrong that it's no surprise that Rebirth is a flop.
The biggest one is that Sephiroth is even in it. Expanding Midgar to its own thing. Sure whatever, on the front I would say it did it well. But the early and constant reveals of Sephiroth which lets be real only exists for newbies and normies who would go "WHERE IS SEPHIROTH, DADDY SEPHIROTH" or whatever gay fujo shit they'd spaz out about, completely ruin the pacing of Remake and also when compared to how the OG did it just made the story kind of suck. Then you have the time bitches on top of it
So you have a game that isn't a remake, but a sequel but also follows the OG so much but literally does everything worse from a story and story progression angle. Not unlike the Modern Warfare reboot
So since we have 7 why on Earth would we want to play shittier versions of that story?