Modern macroeconomics comes off as such a tribal, groupthink discipline to me. Far too many policy suggestions stem from tortured analogies like "we need to prime the pump and increase spending to increase aggregate demand!", or "Capitalism runs on sales, ... you have to increase spending to increase sales!" Where is the analysis of the real cost of programs like this? Why are we so focused on short-term results without considering the long-term effects?
Economics is not physics. You can't run controlled experiments and discover mathematical relations that succinctly describe entire economies. I wish we would stop taking the poor excuse of what is currently macroeconomics research, which is basically terrible curve fitting on small sample sizes over a brief historical period sprinkled with whatever ideology the economist subscribes to, and jumping to terrible policy decisions that affect real people.