LogFAQs > #954063403

because the entire gameplay changed.

it was a "franchise" only because of the spin-offs that weren't main numbered games. otherwise, the first few games followed the same gameplay, just updated and modified as the installments went on.

re4 was where it became a marketable franchise because they ditched the idea of keeping the same gameplay and kept only the lore, story, and "style". but otherwise, it was an entirely different game. and this became acceptable, which is why every iteration is now a different game with the same label slapped on it.

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Disclaimer: There's a good chance the above post could be sarcasm.
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