Ultimately not a great deal was changed in the end, the multi storey car park by the river would have been a bit of a waste having a stadium on the waterfront, I don't see why an underground car park couldn't have been built instead. When that was moved into the West stand like you say it made the whole stadium lopsided so it being removed to help with symmetry was a good move imho.
After we went down from the 60k proposed designs to what it is now I think the roof was slightly lowered more out of value engineering than anything else. It was only 2 metres and that is only at the very end, it would have been roughly 1 metre at the middle and so on. It's easier to manufacture and install say 20 trusses that are exactly the same size than it is to have each one progressively taller than the last. It's then easier to go back to the original architect to inform them that we've messed with their design due to objections from the green cardigan brigade, hence the narrative.
