Here's the rub; the vetting and approval
Granted the government gets its trillion Pesos over the next 5 years, Sec. Ben Diokno will be the first to tell you that the line departments do not have the capacity to process, evaluate and bid that many projects. Even if you triple the staffing and IT, you still end up with projects falling in line to be evaluated and approved by the NEDA-ICC. It is chaired by the President and given if PRRD wants to chair a NEDA ICC (Investment Coordination Committee) meeting once or even twice a month. It is just systemically impossible.
Embarrassing wrongful pursuit
Say what we want about the intellectual lightweights, little minds and second stringers running the Budget, NEDA and Finance portfolios of the PNoy Cabinet. At least they recognized the good policies left behind by GMA, applied “laissez faire” since it ain't broke, resulting in the record economic growth for 6 consecutive years. Mind you this was achieved with only a mild increase in sin taxes. It would be downright embarrassing if the much vaunted PRRD economic team throttles this record growth, induces economic pain particularly to the poor who felt “excluded” by the PNoy era's selective growth, all for the wrongful, greedy, unrealistic and impatient pursuit of this “1 trillion Pesos” of infrastructure by 2022.