Ah how I've missed that so much.
Call me a nostalgia freak as someone whose formative era was the DS era (Gen 4-5) with a touch of Gen 3, but my favorite thing about legendary hunting in FRLG, Emerald, Platinum, HGSS, and BW2 in particular is how the older legendaries were all actually in the world of the region and had lore as to why they were also there, and it felt pretty darn cool and added to the sense of mystique and discovery that came with hunting legendaries, because they truly were part of the world even in those games.
Not to diss ORAS and USUM as I do still love those games but with the legendaries coming from other dimensions, while a cool feature, didn't make them feel quite as special. ORAS was pretty neat with how it did it but that particular method of making old legendaries obtainable lost its charm as time went on.
It's nice to have actual legendaries integrated into the world of SV the game as things that are actually there and you meet in certain places in the world you travel rather than just being thrown in from other dimensions. I've really missed that and I'm so glad it's back to being that way in SV. SV may be a flawed game but I truly feel like the sense of wonder, discovery, and joy that I loved about Pokemon back in the Gen 4+5 days is truly coming back and I am super happy about that. I hope they keep this up in the future.