Q: It seems like Get On With It or Swap Plays for Draws would contradict Play All. Would putting either of these into play cause Play All to be discarded?

A: No. The instructions on Get On With It (or Swap Plays for Draws) only temporarily override the instructions on Play All and only on the turn of the player using it. Since choosing to use one of these is optional, simply putting either of them into play doesn’t contradict Play All, so you wouldn’t discard Play All just because you played one of them (nor vice versa!)