FF7 Rebirth has reportedly sold half what Remake did in the same timeframe

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It could be argued that by trying to appeal to the nostalgia of older players who grew up with FF7 in the 90s, as well as bringing in younger players by extensively modifying the experience, Square may have ended up in the awkward position of not really appealing to either.

Many older fans seem to be put off by the major changes made to the gameplay and story, while younger players may be disinterested simply because they didn't grow up with the original as see it as a throwback to before their time that they have no attachment to.