Parties in FFXIV are 4-8 people.

The standard(light) party is 4 people.
Tank x1
Healer x1
DD x2


Before, in the days of the game people cant mention without massive nerd-rage.

Parties were 6.
Tank x1
Healer x1
Support x0-1
DD x3-4

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Understandably most content has been geared for the 4 person party, or 8 person mini-alliance.

But why?

In the before times, we had parties of 6, with a full alliance, 3 parties, being 18 people.

The larger raids now, will be 24 people. Or, 6 light parties.

As the game goes on, and future content gets added, if a 24 person event were added to DF would that mean we needed 6 tanks, and 6 healers?

With a 6 person party, that's only 4 tanks, 4 healers.

From the description of crystal tower, it seems the groups will split up from time to time, but then, why have them all together if you are going to divide them up anyway?

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Since FF14 does not have a true 'support' class. (Scholar and Bard are close)

If we went back to the old party sizes, 2 additional DD's could get a group per instance.

You may all compliment my brilliance now.