Sure, but this is also a real game we need to win (well, maybe not <1C in that timeframe) , and we only get one chance to play. This example helps people learn, but there are things to adjust.
Another (I didn't mention above) is that construction (including new energy, 'green' cities etc.) takes massive time, energy, materials - it’s not clear that's sufficiently taken into account, and likewise not by real "socialist" planners.