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I'd argue that the control years are even more important for fragile type SP because you want to go year-to-year with those types. Pineda now gets expensive a year earlier and if he is healthy for year 6, hes no longer on your team because you wanted 2 extra starts in a rebuilding season.
Ackley might be ready, but what if he isn't? His OPS right now isn't far off from 2010 AAA line. The Super 2 situation just pushes it into a situation where you can afford a 2-week wait. Z is on thin ice though, so I wouldn't be shocked if Ackley were called up early like Pineda was.