I'll risk saying something that you may not agree with here.
I fish streamers, feather wing and bunny & deer hair Sculpins along with Spey style flies 100% of the time here in Alaska. These flies are tied on hooks ranging from # 1/0 to #8 Bartleet and the Sculpins on shanks with trailing hooks.
You can cast these (all of them) on any rod you wish to use with equal accuracy and pleasure. I also use a braided lead head in my leaders mid section to take the flies down deep. The rods are 6'3" - 9' in single hand type. The weights are 5,6,and 7. Casting payloads is more about your style than your rod.
I believe that the proper line for a rod is more important than the rods action. Of course I am referring to quality rods that have enough backbone to cast streamers. I use what is called single hand Spey casts to launch streamers and seldom ever make a back cast. Once you learn simple casts like the snap T, and Perry poke Spey cast, you can fish your streamers with whatever you have.
One of my favorite streamer rods is an 8' Orvis 6 weight bamboo, it works as well as a 9' PM-10 or a 6'6" fiberglass. Short rods = small creeks, longer for medium creeks. For large rivers I use 13 - 15' 2 hand rods and the same type leader system but with a longer lead head in the leader. The Spey rods are cast in the same manner as the one hand rods and having the proper line is again the key more so than rod brand.
Anyway, that's how I see streamer rods, they're all streamer rods