"Too wide" is in the eye of the beholder. I typically sit eight feet from a 130" ultra-wide projection screen. That felt enormous the first time I used it, but after a decade it seems "normal" and I occasionally think about going bigger.
I think generally as you move up in quality/performance the app stuff drops away. Epson for example has a bunch of sub-$1500 "streaming" projectors, but as you move up into the more purpose-built "home theater" models that quickly disappears in favor of things like higher contrast levels and motorized lens/shift memory.
Yeah, I have 11.1 with sound treatments and a receiver that does room correction, and some movies are just annoyingly mixed. Dune (2021) has the voices mumbled and so low that when I turned it up enough to hear them it caused the explosions to be so loud that my cat jumped off my lap and ran out of the room, which I don't think he's ever done before.
Christopher Nolan is probably the most infamous offender; he's said even other filmmakers contact him and complain about his mixes. It's apparently how he wants it to sound, and he's said things like he sometimes treats dialogue as a sound effect and mixes it low on purpose, despite the many many articles and such about how much audiences hate it. I could swear at one point he even countered with something like "you shouldn't need to hear all the dialogue to understand what's going on". Ugh.
Some models include a carrying case, but I'm not sure I'd describe them as "very portable". For example the Glove80 has a hard-shelled case, but the case itself is probably bigger than most laptops. The Moonlander packs smaller into a soft case that folds like a wallet, but it's less protective.
There are designs with far fewer keys that could probably be carried around more easily, but then you have to learn their layer/chording system.
The Svalboard has an extra issue that some folks prefer it to be placed below desk height, such as attached to a chair or sitting on an under-desk shelf, so it's not something you can generally just put on a table in front of the computer.