Howdy!

I checked with the development team about their plans for Darklight equipment.

They do not have any plans of increasing the difficulty in exchange for a higher drop rate. Also, since Darklight equipment is one of the strongest of all the currently obtainable gear, a proper drop rate was established with this in mind, and as such we have no plans of changing the current drop rate. However, after monitoring conditions for a while and based on the feedback we receive we will look into possible adjustments for the future.