Public events should be unique horde modes with level of difficulty added to them similar to Nightfalls, Dungeons and Raids. Think Escalation Protocol and Altar of Sorrow but with rewards for each encounter. Also, yes to what you mentioned. We need our current content to be “compelling”. It was a bad move for them when they removed Adventures from the game.
They were like mini solo strikes with rewards. They were difficult without the need for champions. It was a misunderstood piece of content that had some effort to them.