Yeah I mentioned that in the end of my comment, together with the other issues that would typically lead to.
It was definitely confusing to new users: Insert a disk was something which anyone could do, since it only involved simple movement of a physical object, but ejecting it required you to know and understand the OS.
This was quite an "impedance mismatch" between what should ideally be two symmetrical actions, and I remember I had to help out my mother quite a few times :)
There was on the Apple Lisa. Or rather ejecting a disk was something you did in the OS which made sure everything was written/closed before allowing the disk out.