Random Augment system.

[Shirai]

Just because a handful of players were lucky doesn't mean hundreds of others are. Which is unavoidable.

And that is the entire issue!!!
With the Delve Augments you can choose a path and to max those also takes time, effort and maybe gil but you know what the end result will be and somewhat how long it will take you to get there.

With Skirmish it's a game of roulette, which can either cost you a few gil and a few days if you're lucky, or take months of repeating the same thing over, and over, and over without getting even close to the desired result and without knowing how long or how much it will take before you do get what you are looking for.
With an event that by itself is coma inducingly boring.
And for what? Gear that may be completely obsolete again when the next Delve hits?

And all I read from your reply is "Lol, deal with it."