It all depends on where the "lock" point is and how many "phases" of action a particular rod can have.
I was surprised, out of sheer necessity during a hot bite - regarding the performance of the E-Cup on the FCL Extreme 81. It performs admirably, however, you do need to pick your popper type - E-Cups were great, however, the deeper cup of a 150g CraftBait GT-3, not so much for obvious reasons.
The tip absorbs some of the direct action given to the lure which in turn, minimizes certain lures from jumping or spitting out of the water.