Nice lesson.
I myself sufferd from PUDD ( Pinky Under-Development Disorder) for the first few years I played. Same as you I figured I could do without the little guy. It was so small, weak and uncoorperative. I just figured I'd master a 3 finger fretting technique that all would envy.
Eventually, I could hide no more. My PUDD caused my playing to be limited. Once I realized I needed to use my pinky to realistically progress on bass, I felt like I had to sort of re-learn all the technical work I had done in those first few years of practice. It was real hard trying to get a hold on my PUDD at first but little by little my pinky came around. What a waste it was letting my PUDD hold me back like that.
Anyone out there convinced they don't need their pinky( so long as they have one), better re-think it.

No one wants to get stuck playing with a PUDD.