Is WordPress' use of God objects really such a big problem? I mean, sure wp_query is used for every possible purpose and is the most mutated piece of horror every. But what is the harm?

Agree with @h3ll. I still wonder why WordPress hasn't been rewritten yet. It's a great piece of software and I began learning about web dev from it. But, when I look at modern frameworks, WordPress is somewhat lacking in many aspects.

Having said that, don't fix something that works, right? :-)