"The perfect is enemy of the good," is an observation that in various forms has a long pedigree. As has the corollary that in striving for perfection we often end up worse off than before.
Jesus seemed to accept the constrained view when He observed that the poor you will always have with you. It should be noted that in saying that Jesus was not suggesting that since there will always be poor people, we shouldn't do anything to reduce poverty. More generally, the doctrine of original sin suggests that people are not in this life perfectible. Interestingly, there typically seems to be two reactions to that realization. One is the counsel of despair. We will never be perfectly good so why bother doing anything at all. The other is the determination to strive to improve and do better and derive satisfaction from anything done better or done well even though it is not perfect.
Perfectionism, the idea that human moral or spiritual perfection is attainable, has long infected Christianity, always with deleterious effects. The perfect is always the enemy of the good.