But then there is the question of why does Karma have to roam ? Being its a lane focused pick ?
What you said is "enchanters doesn't always have the best roaming setup. Right now there is not the best setup for your lanes either if you are BDS, obviously Ryze with his Flash, E, get the root down with the W"
I assumed the roaming part ends at "enchanters doesnt always have the best roaming setup". Since after that you speak about the lane setups for BDS, you said "either", which tells me you moved on from the "roaming" part to the "lane setup" one.
All in all i struggle to understand the thought process here is what im saying. Ryze - Xin is one of the best setups in the current meta in terms of midlane (Viktor / Corki / LB (unless paired with a Lee i suppose)) are far worse than Ryze setup anyways. And Jayce needs no setup since he plays for lane too.
So i still dont make sense of it as a bullet point tbh. Not from a mid setup perspective, not from a Karma roaming perspective either, since i dont get the Karma roaming point (like the need for it to happen and how it would hurt BDS if it didn't).