The best panel was Disney+. Everything else was fairly lackluster. When your big selling point for the convention are the panels, you have to deliver. Disney definitely did not do that and it's definitely disappointing. They have to get out of the cycle of announcing something 5 years in advance (outside of a new theme park) and really let each D23 focus on the next 18-24 months. Announce and share details for what's coming in the next 18-24 months (since D23 is every other year) and then go from there.
Apple has got this down pact. 3-4 presentations a year to talk about WHAT IS COMING NEXT. Not years down the road. In the next 90 days (and usually less time frame than that). The video gaming industry is learning this as well. Don't announce a project years in advance. Talk about it and release it in the next 12 months with other timed releases for info. Disney could learn a lot. Heck, even Universal is getting it right and they're in 'second' place.