OpenSolaris had a GNU userland. The BSD ancestry of the Solaris userland isn't the problem. The problem was the senseless defaults and cryptic command structures ("shutdown -g0 -i5 -y" instead of "shutdown")
Here is a barbaric and senseless default. Do a crontab -e without $EDITOR set and you'll be dropped into ed. I realize that it's the "standard editor" but the joke stopped being funny when I needed to edit a file with it.