You really hit the nail on the head here. It’s so easy for people to see something that took years to create, and pick out the one or two flaws in it. Meanwhile, those flaws are exponentially small compared to the benefit that an idea might have had.

That’s a bit abstract. Basically a lot of good cake from OO. It’s not all good, sure, but polymorphism is a pretty darn good idea. Substitutability is a good idea. OO won’t solve all of your problems for you, but it isn’t inherently creating your problems either.