To get the first bit out of the way: Assassin has good afflicting, but my artifacted aps during setup is ~1 aps (bounces between .8 and 1.2), equal to shaman. With a snapped trance, I hover around jinxed porcupine aps. Hypochondria (excluding the double proc which I already agreed needs to go, and I even suggested non-aps changes to it in this thread) inches that up slightly higher with another .1 aps. Deadening is a dramatic boost to snapped trance aps (from .1ish to .5ish). Shaman doesn't have hemotoxin, but assassin has heavily gated impatience use + focus is a better lock breaker + failure. Shaman turns into sabre dsl on crack once marks ignite, where assassin has to stop aps entirely to devour or puncture, or they go for one of the more req heavy true instas in the game in Annihilate.
So, no, assassin is not as bad as shaman is right now. Strong? Sure, but the sample size of Assassin is also literally someone who has been playing only that class for years.
Inhibit still gives confusion, but later. You can also swift/throw inhibit, if you didn't know.
'I only have just under 1 aps while you shield' is kind of funny, especially considering how underutilized bat has been. Breaking shaman momentum requires running, active cures, or killing them. No class is going to hinder a shaman before they do the same. To compare, assassin can pull 0.5 aps on a shielder and can't flat out ignore fenugreek.
In summary, Shaman is far more powerful right now than it seems you want to give it credit for, which is odd considering you went from losing consistently as Outrider to winning against literally everyone as Shaman.
They're not going to stop making promos (or take ethereal filler out of them), people aren't going to stop trying to win, and a Shaman is unlikely to get a lot of 1v1s (I feel ur pain). That means the only way to move forward here is to discuss how to make the chain more palatable.
S1: Increase chain distance S2: Decrease chain duration S3: Decrease chain uses S4: Increase chain availability further and add non-promo ways to acquire them.