There is a lot of good wisdom from the 60s, 70s, 80s that people forget and end up re-inventing. I don't think I'm the first person to make this comment.
> OO
It's very subjective I'll admit. But I don't like OO, and it took me along time to realize why. There are many people who feel the same way. The difficulty is in explaining it. Because you have to look at large systems, explore the evolution of these systems, and pluck enough examples where things don't work.