Should dematerializer and biscuit be in the same row? (Also Manaflow balance questions)

While I understand you wanted to make midlane more interactive by changing manaflow band/presence of mind, it likely also killed early mana sustain on champions that prefer to spend mana to shove and roam (e.g. Taliyah). Champions looking for mana sustain who also harass poorly while interacting with the wave are now priced into biscuit delivery, but those same champions often REALLY want dematerializer = / Meanwhile, champions that have passthrough abilities that can hit the wave while also hitting their opponent are comparatively buffed, since new manaflow band favors them a lot.

Would it be that bad to have biscuit and dematerializer in separate rows? If so, why? Is there a concern the sustain is too oppressive?

EDIT: TITLE WAS WORDED WRONGLY OOPS