It's not just the architectural firm's fault in this case: with the client backing away from the LED art component, one is prone to conclude that Brookfield, or those leasing from them, (KPMG?), are terribly conservative and want their tower to reflect that stolidness.
It is also worth noting that Scotia Plaza and Royal Bank Plaza, both of which appear near the top of the heap when fans are asked which of Toronto's skyscrapers are their favourites, are both WZMH, so that firm has not always designed dull buildings...
... but no, they are not Renzo Piano Building Workshop (just to demystify your reference, ProjectEnd).
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PS - I wonder if KPMB will ever design a building for KPMG?