I mean, we could also do your plan and just hand off essentially dictatorial power over spending to the richest man in the country.
You do not throw out the baby with the bath water.
Everyone is impacted by the fact that money-printer-fueled government spending crowds out private spending / investment / growth.
It’s Congress’s role to allocate funds to certain purposes, and the President’s to “take Care that the Laws be faithfully executed,” including overseeing the bureaucracy that implements them.
The President already has dictatorial power over the bureaucracy, as per the Constitution.
Unless you extend it to that, in which case why have courts? Its not like they have enforcement power and the president can stretch discretion to the limit.