I'm sure somebody here with more construction expertise can explain further, but playing with the balconies is more than just a so-called "cheap way to give a building interest". The lack of a standardized floor plate adds to the cost and complexity of construction, and is likely more expensive than producing those cheap wavy things that litter Lakeshore and the Humber Bay area.
Though decried as vacuous boxes, the minimalist detailing and shapes are in response to a (thankfully) popular trend of neo-Modernism, rather than supposed pure corporate greed. The higher quality glass and finishing touches on better condos such as CASA (and other similar aA buildings) are a testament to this. Buildings like Trump, Malibu and Pinnacle may appear more complex to the casual observer, but their cheap materials and/or clumsy designs come off cheaper than a well executed box.
I don't intend on sounding like a blind aA/neo-Modernist defender, but it's tiring to hear the same cheap box routine in every thread. Excluding a couple missteps, our sleek glassy boxes will stand the test of time a lot better than dated, try-too-hard, over-styled condos. Just take a look at most 1980s PoMo. Absolute World and the L Tower are great designs, but it's not realistic to expect that every condo be designed by world-famous architects, or through international design competitions. People love local, so let's embrace our local talent.