Artist's impression or adjustment?

The artist's  impression of plans to upgrade Birmingham's  National Indoor Arena and open it  up to the canal look impressive, but leave some questions.
Take a look at the impression and the reality in the two pictures.
Why have the four tower blocks in the top  right lost 4 or 5 stories?
Is it really planned to destroy the lovely mature trees that edge the towpath at the Old Turn?

Why can't  planners  - and the public - be presented with something  less artistic and more accurate?