In the rig demo video, you enable selection and visibility for all of the different ball types, then you can just select the rig and all the balls together with a box select and duplicate it.

I can't get that to work in 2.8. When I enable visibility and selectability in the UI, on the active ball type from the rig UI is shown and selectable.

Then when I duplicate what I do have, it creates the new ball object in the same collection as the original, breaking the drivers for both rigs.

Help please. 

Shouldn't there be a difference in first bounce because of balls size differences? I mean all balls will fall at same speed but basketball should bounce first because it's larger.

im confused on when your lowering amount of frames in the beginning . are you following a set amount each ? or winging it ? 

I know you talked about it earlier, and probably even in the fundamentals course, but i really wonder why the setting "only insert needed" is actually useful or not depending on the context.

In this one course i could not insert new keyframes based on whether or not the object moved, i understand what that means, because no transformation was applied to the object, so from the software point of view there is theoritically no need for new keyframe.

But isn't there a more user friendly way to set that?
Going in the user preferences all the time to change this setting based on the context is a bit stupid, why isn't there a setting directly in the dopesheet, or graph editor, or timeline?
Nobody ever developed an addon to fix this?

It's a bit like going in the user pref of photoshop all the time to change a vital setting to your workflow.

Or maybe i'll later discover that with experince, animators choose one setting and stick to it forever?

I get always an error when i try to download the file.