What if "battle system changes" includes dividing DPS types

[Aramina]

Can somebody give me a valid reason as to why FFXIV has only 2 DPS slots per party and not 3 slots like most other MMOs? Having 3 DPS slots for Light Party and 5 DPS slots for Full Party would solve a ton of issues.

Sometimes, being different does not automatically make things better. FFXIV only having 2 DPS slots is a perfect example of this.

It's unlikely someone will be able to provide you with a reason that you, personally, will find valid. That said, one ranged and one melee is why.