Same. When they explained why they assumed and required /usr and/or /usr/local was owned by steve or bill or whatever, with a straight face, I was gobsmacked and never touched it again.
Like, how did people so ignorant come to manage such a project? I excuse most of the users but not the authors who have the balls to call themselves "engineers" on top.
I wouldn't be suprised if they weren't the very reason shortly after that Apple took over ownership and brute force OS control over those dirs.
It's just the same on Linux though. Don't touch anything under /usr but /usr/local or you will run into issues, third-party software uses /usr/local, and that is why Macports ended up in /opt/local - guaranteed free of collisions.