(Replay attack protection is a method to prevent spending of existing coins on *both chains, which would be possible if BU went ahead with its confrontational plan to try to *replace BTC).
Care to explain in simple words for the tech weary? From my knowledge "replay" implies "play" first, a wallet address that don't move (like cold store, or Satoshi's BTC) cannot be touched.
"Bitcoin Core developer Jameson Lopp tweeted, It appears that BU devs have no intention of adding replay protection - their plan is to kill the Core chain instead.
That is some serious assault. Nobody in a right state of mind can support people of those intentions.