Why the Final Fantasy XV and VII universes MUST be connected!

Giving my own personal outlook on why the Final Fantasy XV and VII universes must now be connected or run the risk of becoming a mess. Covering point from timing of the two games, their plot, the importance/emphasis placed on the weapons and the importance of dodging the fan service trap.\r
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Dont fall into it square. Please dont cower out of tethering the universes. MAKE FFVII AND FFXV DIFFERENT BUT CONNECTED!