Unfortunately, the official plugin cannot be a full replacement. It’s missing the ability to post multiple reactions!
This is a major loss to the utility of reactions. For this reason, I sure hope Retort will be maintained for now. I wish I had the capacity to do it myself, but all I can do is invite anyone else who could do it to consider making a fork of the official plugin that uses the updated code and UI improvements but adapts them to multiple-reactions (perhaps call it “multi-reaction”).
For now, Retort works. I’m disappointed that the new plugin didn’t embrace the multiple-reactions approach from the beginning.