99% of the time Scala programmers don't have to worry about variance. I've been using Scala for over 5 years and it's never been more than a cursory concern, th

99% of the time Scala programmers don't have to worry about variance. I've been using Scala for over 5 years and it's never been more than a cursory concern, the defaults usually work fine. You just have the flexibility to work with it how you want if you need to. To compare it to neurosurgery is simply disingenuous