It's false that developers of these large scale projects hold the purse and aren't constrained to budgets that deliver on the status quo rate of return to investors. No one is self financing. IMO, value engineering affects curtain wall vs window wall, etc. more than design and design is, unfortunately, a subjective matter left to one's personal tastes. Time and time again, the developers from artistic fields of work put up better architecture than those that got there from the construction side and cladding used isn't all that different. It's definitely not indifference. The skyline is full of inspired superficial gimmicks.