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Postal service is very different from everything else you listed. The reason we're pumping so much money into those is that money should act as a significant multiplier for creating jobs and moving money through tbe economy.
Subsidizing the Post, while creating a better service doesn't have the same sort of multiplier benefit, other than the Keynesian hole digging style of employment.
I may not love the climate effects of some of these projects but from a "will these employ people and get a decent amount of money closing through the economy", the answer is pretty definitively yes.
Rural communities already overwhelmingly use community post boxes. If the proposed changes really disadvantage rural folks, then that'll be something to change.