I think what I am thinking of, is in the trailer for Tundra, the person says 'A certain someone' sends us out to investigate. Which now, with what Hop says on Armor, it is almost 100% Sonia.
Anyway, on topic. I think Galar will become more connected in Tundra and if we have a 3rd expansion after SInnoh, which currently there is no evidence for. With who we know is returning, there will probably be connections, especially with the Regis with the two new Regis.
Usually when we get remakes of a previous gen, there is almost always some sort of connection between the two games. But I think Regis may explain why it seems to be 'so far away' which honestly doesn't make sense being that we have planes that can easily get us.
Unless, SwSh takes place before previous regions.