The prequels sucked, yes. But not because they ruined ESB’s reveal.
I think we can all agree on that. If the prequels were three exciting films, nobody would care if it spoiled Vader’s reveal. On the other hand when speculating on an alternate universe versions of the prequels, why not consider keeping some secrets for the OT, such as Vader’s reveal, the Skywalker siblings, or the fact that the a great Jedi master is in fact a space leprechaun. 😃