Yes, but a lot of the complexity is unnecessary bloat. Almost every project I've ever seen or worked on was full of unnecessary complexity. People naturally tend to over-complicate things, all the programming books, including software design books focus on unimportant aspects and miss all the important ones. It's incredibly frustrating.

Yet, if someone were to write a book which explained things properly (probably a 3000 word article would suffice to turn anyone into a 10x dev), nobody would buy it. This industry is cooked.