“Don’t make perfect the enemy of good” essentially says that it’s better to do what you can in the short term to reduce harm or make positive change than to wait for the perfect solution and do nothing in the meantime. The idea is that the good is still going to help some people while we wait for the perfect solution to the problem- which, crucially, may never come, or come too late for a whole bunch of people.

One example would be letting a parent having their kid eat fast food instead of a perfectly healthy diet because their parents live in a food desert; not ideal, but it’ll keep the kid fed and alive.