Like all of my suggestions this one is self serving as I currently have a rot lair.
I've reached the 3rd tier of the rot lair, which I think is the final stage and it's lacking a lot of the basics that other lairs get around tier 2. Typically lairs offer a spellcaster type NPC to offer buffs, a purple crystal/healing station, and a placeable to spawn a themed goodie each reset but the rot lair doesn't seem to develop any of these benefits. It has storage and some NPC guardians but few other benefits. It'd be nice to get a little bump in content to put it on par with the other lairs, given that this particular lair needs to be set up far from the HUB and leans toward the loner style of play.
Anything is better than nothing
The Rot Lair's biggest point of interest is a Druid Only Feature. The Druidic Ritual to summon a boon, item, or guardian that is Rot Themed. (Which is likely why it was not offered any of those other features).
I've made a terrible mistake
Yes the Rot Lair perk is for druids.
If you're not a druid, then I guess it sucks to be you.