The view of the North Stand/Stadium from Joe Mercer Way is misleading in the pics above as it's taken as you get to the crest of the rise up from Blue Car park/Forge lane. The new extensions will be a lot nearer to you at that point than shown, so will fill the view more.
At the moment, from the bottom of the hill you can only really see the roof and now Co-Op Live is there you can hardly see it at all from Philips Park until you get to this point...
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Although this image is deceptive as it's from a camera about 8 feet in the air, so a higher view than any pedestrian would have, until they got about halfway up the rise, where it disappears even more.
The new buildings around the new City Sq will be a lot nearer to us from this view than any normal stand extension would reach, and again remembering that the very rectangular Co-Op Live is now filling/dominating the left of this picture, then the designs will IMO fit in better and compliment that end of the site. As has been said, the majority of arrivals will be from the other directions so the initial vistas of the ground for most, other than people parking in the Blue CP, won't be this one. The designs provide an excellent functional space and that's the main thing and what will set it apart.
On a not unrelated point, I've said it before but using the name Forge Lane, The Forge End etc for the new North Stand would be a great nod to the history of the site and also quite a cool name. IMO