SLOP debuted under unfavorable conditions during Covid (opened when the park reopened, so it didn't get the marketing push it deserved) + low capacity throughput and the need to use Virtual Queue.
Kung Fu Panda is a poorly designed ride. Madagascar at Singapore is a poorly designed ride.
Meanwhile, Disney debuted two new dark rides (Runaway Railway & Ratatouille Adventure) and get great crowds for them.
E.T. Adventure gets a healthy dose of attendance each day, and it's been operating since 1990.
Universal is sitting on great IPs that lend itself easily to Omnimovers & Classic Boat Ride-style dark rides: Trolls, Kung Fu Panda (if done well), Minions, Shrek, etc.