In a party composition without a Warrior or a Ninja, it's recommended to use the 2-Sen opener.
In a party composition with a Dragoon, it's recommended to use the 1-Sen opener.

What about in a composition without a Warrior or Ninja, but with a Dragoon?

I'm guessing the reason nobody talks about the 2-Sen opener when it comes to damage is because its bad? 1-Sen and 3-Sen seem to be the only openers discussed now.

So TLDR: 2-Sen is the gimped opener that sacrifices personal damage for sub-standard party compositions?