I was just about to post the same thing. I’ve been using Linux for almost 10 years. I never really understood the folder layout anyway into this detail. My reasoning always was that /lib was more system-wide and /usr/lib was for stuff installed for me only. That never made sense though, since there is only one /usr and not one for every user. But I never really thought further, I just let it be.
The “Forgetting How Your Own Code Works” is real. I’ve looked at code, thought to myself “what fcking idiot wrote this garbage”, only to see my own name next to it. It’s a very humbling experience