Yeah and I get that and I get the point, but that's also kind of assuming that they're prioritising lore over gameplay. I just get the feeling that they'll introduce something that would let you switch between forms.I think you are the only one, because you're missing the main point of Alola forms, that the species as a whole developed differently on Alola than in the rest of the world. They're not switchable forms.
Like, take ORAS. Primal Groudon/Kyogre is built up to be an extremely dangerous form whose very presence threatens the structure of the world's ecosystem and even the survivability of the human race. As soon as the event is over? "Here, take this orb to let them switch to that form any time you want. Oh it's totally okay because this time it's somehow contained".
No matter what lore they introduce, Game Freak will always prioritise gameplay features and obtainability over them period. It would be correct to say that they won't definitely introduce a form-switching item, but I don't think it's off the table at all and it feels like something they would do.