Worldbuilding

I'm not really sure that "scp monsters come from quantum foam" is any more or less scientific than "scp monsters come from the multiverse"

What I've learned from LeGuin is that the science and physics are actually the boring part in the world, instead focus on now the technology interacts with people and the story. For example, LeGuin introduces the ansible in one of her stories, which is a device that allows for instantaneous communication between star systems. She never justifies how it works or has the need to explain it. Instead she just focuses on what this means for individuals and political structures in her books. What does the ansible mean for people who traveled out to the stars before its invention? What does it mean to be marooned on a planet with the possibility of a working ansible on the other side? Or to point to the lathe, how it works is not as interesting as the effects it had. I'm pretty sure I am remembering this fro .an essay or interview she gave, but I can't find it now.

Not much of a writer, but as a reader tropes aren't necessarily bad. They act as a shortcut to allow context to flow to the reader and can be very useful when used sparingly. As to your basic premise, as a reader I'm already bought in, I'm also bought in that they came from a portal. What matters more is the story built around the event.

Finally, as a musician, obsessing over the details is a surefire way for me to never release work. One must find the balance between attention and obsession when it comes to details.

Yes, if I'm interested in it. No, if I'm not interested in it.

I dont think theres a correct answer but considering my own worldbuilding is mostly inspired by mythology I dont exactly think much of the science behind it. Like I have respect for folks who really do the legwork and think of the geography of their world in a way that it makes sense etc. (But I dont do that) at least not in any big fashion.

For my own worldbuilding I've just sort of let the magic system be guided by the aesthetic I'm going for and I just try not to overthink it too much otherwise: it's definitely a System with a number of discrete Rules, but only to the extent that the system has enough of a vague upper and lower bound that it's interesting. Because nobody's going to give you a standing ovation for how much time you've dedicated to explaining the unexplainable: you're making art and it succeeds as art insofar as it manages to evoke a feeling, right? So you're allowed to have a few plotholes, as a treat. I dunno if this makes any sense I'm just sort of typing off the cuff. I think OSP recently did a Trope Talk about magic systems that might be relevant.

Also, what makes the multiverse racist? Just the idea of some sort of mysterious hostile force coming from far away?

For anything unique and important to the story, yes. Otherwise I take a "you know what this is" approach to things like spaceships and stasis pods. Widespread genetic engineering and the presence of military crab people, on the other hand, might take some explaining.

i have to or my brain explodes. i love combining fantasy tropes with sci-fi. i have a hard time just accepting things as they are because "magic", even if I find those kinds of universes fascinating to me.

cool thing is I've learned a lot about physics. bad thing is I can't just let it go

obviously you need rules, even SCP has "rules". but if actual scientists are involved they are going to study stuff and classify it and come up with their own theories. so you at least need what they think is happening to fill out your project, even if it's incorrect.

another bad thing is I tend to lean on quantum stuff and Planck-scale weirdness to do anything weird.

or what I call "resolution errors" where stuff not of this world basically has no physical structure below certain scales. so it has properties that can be measured (mass, hardness, etc) but it's like the material is made of a single atom. electron microscope would just see a blank, featureless plane of "matter".

i do stick with energy and matter can be neither created nor destroyed as a foundation to even my weirdest shit. it's got to come from somewhere (multiverse, foam, wormholes, dark energy).

i also love leaning on "dark energy is actually consciousness and the very act of thinking and sapience is taking up physical space and making the universe expand faster". this allows the concept of primordial consciousness, maybe it came about during the Inflationary Epoch. there's your "gods".

the above requires your universe to have a quantum theory of consciousness. but it means somehow (somehow) thought itself can access the energy of space-time itself (zero-point or whatever). collapse a tiny volume of space, free up energy, do stuff with it (magic!) (but also you are collapsing space-time, that's bad)

the SCP approach though is just to say reality itself is a shared delusion by all sapient perceiving entities and anything goes

Your worldbuilding: "No, I don't really bother with science"

My worldbuilding: "A paper called 'In Vivo Deep-Brain Structural and Hemodynamic Multiphoton Microscopy Enabled by Quantum Dots' reported..."