I honestly liked that we only heard voices of Jedi past, seeing a Force ghost convention would probably not have worked. But Anakin, Luke and Leia, the Skywalkers could have, maybe after we hear the voices.
Another thing, anyone else find it weird that we hear Kanan? His story was not that connected to what they’re now calling the Skywalker saga, he never met anyone I think. Maybe we could just keep the most important voices.