Okay maybe I'm overthinking a bit but
In 400+ years, Philip, Caleb and Luz are the ONLY humans to get to the Boiling Isles? Luz is an outlier bc of how she came through a man-made portal, and you could argue that Caleb and Philip went through portals that Evelyn made, but, really? In all of history, there was never another witch who did something similar? A human who fell through a random portal? No????
Clearly there had to be some sort of regular contact between both realms, given how the Boiling Isles speaks a human language even before Belos and seemed to be pretty on-par when it comes to culture and technology. For that to happen, simply trash floating over wouldn't work, there has to be actual contact.
Also, the portals can't be concentrated in Gravesfield. The Boiling Isles speaks English in the early 1600s. It was like very very early times in the English colonization of America. The portals had to open in other places, namely in the Isles.
It also occurs to me that portals possibly aren't as onesided as they appear. Sure, Titan Blood cuts through the realms and allows for portals, but there's probably something in the Human Realm that could make the portals too, or maybe there had to be something in the Human Realm that allows the Titan Blood to actually make the portal in that specific place. Timepools are formed with magical algae and Titan Blood, it's likely that there had to be some sort of receptacle for the interdimensional portals.
Heck, the portals in the Human Realm appear fixed in place! The door opens to the old house no matter where it is in the demon realm. Perhaps there has to be something in the human realm to anchor the portals to it.
I've always made it to where portals would pop up in bodies of water all over the world considering that's how all the human junk gets into the BI. That and Philip rambling on about Eclipse Lake, supposedly that being the way he arrived (yet he had to hunt it back down???) if that was even true. You could probably jump into a swimming pool and end up in the BI without even noticing a change since it showed the Emerald Entrails running through shallow water without being burned after crashing Darius' ship.
Don't overthink the English and Colonial stuff. That's only going to give you a headache. Dana did say the Boiling Isles were like the human realm so I'd just leave it at that. It's not the best answer, but it's one that we can just settle with. It's like that with most shows/games that deal in high fantasy if you think about it, everyone speaking English and having towns and such relying on what we know as colonialism. Just think of it as the BI went through the same thing we did and the witches won out (considering Lilith says demons have never been united under a ruler but we can speculate that being wrong as well due to Flora and her ilk.) Time is even messed up in this show too so there's that.
Correct me if I'm wrong, but I remember something about the Owl House happening in the same universe as Gravity Falls, which means that there IS strangeness going on. Wouldn't surprise me to find a portal from GF to BI in the lake with the Gobblewonker. We absolutely know it's connected to Amphibia, but that one doesn't really show much in the way of magic/strangeness originating from the human realm than Amphibia cutting into it. Considering how Star VS. ended, people will have to fight me on the idea that one's connected to the same universe.
I did mention this in another post, but the door is possibly an outlier, due to what we got the show. I think it's something that the Collector helped Philip make and Philip attached it to the house so he could literally return home when he was finished. Caleb and Evelyn, if the Rebus and the story were to be believed, created portals using solely Titan's Blood in secret. I don't believe Caleb or Evelyn would have attached it to the house if they were intending on keeping everything on the down low.
I think I saw something that it's the size of Vermont? I mean, it is the corpse of a once-living being and not a landmass on its own. That alone raises questions of when the Titan was alive and where they lived, how old King really is, etc. With that in mind and the technological advances the BI has, I'm wondering if they honestly believe they are the only ones. It's kind of like how Earth is the only planet that is able to sustain life and we may or may not have anything else living in the rest of the solar system/galaxy. The Titan Trappers seem to keep to themselves so they'd be pretty alien to the BI. That only creates the headache of why no one said anything to King about the VERY APPARENT TITAN TRAPPERS WANDERING THE BOILING ISLES.
Yeah, the Boiling Rain thing was... strange, especially if you consider how drastic of a change in temp it has to be just to get it to snow on the knee. The rain actually makes me think more of stomach acid than boiling water but meh. I'm honestly surprised it wasn't more destructive to buildings, the flora, fauna, etc just for being boiling water considering it put holes in Eda's cloak. Can't use magic as an excuse since you'd think EVERYTHING would be boiling rain-resistant by that point. Of all the things they had to use for Belos' end, it was boiling rain. Nothing pertaining to the destruction he caused, just the weather among physical violence. Weak. -__-
It would be interesting to have learned about, though I know not every show can use actual science or create its own to explain its world like Futurama.
