InDesign uses shift return for a forced line break (AKA soft return)

Not sure why your InDesign uses Command return for a line break.

I get quick apply on CC2017 InDesign, when doing a command return

Shift return has been a soft return (AKA forced line break) for as long as I can remember in both programs. My recommendation is to stay with the defaults, so when you go work on another computer or they release an update you wont have to continually edit the keyboard shortcuts.
Mike, the reason why InDesign may use Cmd-Return to make a line break is because – unlike Illustrator – it can be set to that key combo if you want it. For whatever reason.
InDesign is much more flexible when it comes to define keyboard shortcuts. In Illustrator one (too often) just get a message that you cannot do this or that shortcut without using a special modifier.
Anyway, in this case it just seems to be a hardware issue that has to be solved with a warranty claim.