What you're telling me here is that you aren't aware of what the randomization is for in randomized controlled trials.
"Our treatment units are stupidly heterogeneous" is exactly the problem it solves. A century's worth of developing increasingly sophisticated statistical techniques for making do without random assignment has thus far failed to accomplish anything than provisional mitigations that are notoriously easy to use incorrectly in practice.
"Our treatment units are stupidly heterogeneous" is exactly the problem it solves. A century's worth of developing increasingly sophisticated statistical techniques for making do without random assignment has thus far failed to accomplish anything than provisional mitigations that are notoriously easy to use incorrectly in practice.