[krazydad]

My mom also has no idea what right-click is. I showed it to her once and it blew her mind. Then she promptly forgot about it.

I figure as long as you don't hide essential functionality in your app's 3d-touch interface, and primarily use it for short cuts, you are probably okay...

[kiddz]

Yes, it's not that it's not discoverable, it's that it's easy to forget and/or unnecessary to remember.