The wider point. though, is what's being requested is a dedicated atmospheric area, which wouldn't even necessarily be for more than 10% of the 60,000 capacity, where vocal fans could gather and have the option of putting on displays.
A significant part of the issue is the ground is a former athletics stadium where the sound doesn't really carry from the lower tier. It has then been developed in a piecemeal fashion, more due to circumstance than City's fault, But when SSL3 was opened I'd doubt it was known that rail seating would subsequently be put in SSL1. And when the rail seating was put in SSL1 I'd doubt it was known how many rail seats would be in any new NS.
It may be that City consider 3,000 rail seats in the new NS means there is enough rail seating in the ground. The end result is looking to me, though, like there will be 3 potential atmosphere areas none of which will be able to hear the others particularly well.
If the ground had been built as a football stadium with steep stands close to the pitch there probably wouldn't had been any need for any club intervention. As it is though, if City aren't fully committed to making the new NS an atmospheric stand I think the best outcome would be to put rail seats in all of SSL3 instead and make provision for any season ticketholders unhappy with this. The club could then decide what to do with the shiny new NS.