Wow so much entitlement re: Sleeper. FFS BUNGIE JUST GIVE IT TO US.
Chill your bones, dudes.
The only mistake Bungie made was hyping up the SS pre-release, so now everyone already knows this leads to the SS eventually. If we didn't know that, people would be freaking out over this mystery mission with unknown rewards, just like the Spindle mission caused a lot of excitement because it was totally unexpected.
I will say that so far it's a bummer that the quest chain itself isn't really offering any lore and the "puzzle" was looking at the order in which a few knights spawned.
This does make me suspect that the ghost stuff from Paradox may eventually lead to another step too, though. Glad I ended up doing it.