Asklemmy

A bag of holding would be pretty sweet, barring that, an open source brain chip.

A direct clone of the Switch JoyCon that works seamlessly on PC and PS5.

A version of the ASUS ROG Flow that is about 20% lighter and has about 50% better battery life when not in dGPU mode.

A version of the MiSTer and/or Analogue Pocket with RetroAchievements support.

Yeah, I'm a weird gamer.

I want a small snowboard, like 121 cm, similar to the old rossignol mini, but wide enough for my big ass feet.

I rode the mini for years with my feet pointed outward over 45 degrees and ended up doing a lot of damage to my knees.

I pretty much only snowboard in the midwest US, and want something that feels more like a skateboard.

A train that has a stop somewhere in my neighbourhood.

A single remote that turns on my PC and TV

A device that is the size of a pen drive, costs a fiver, produces unlimited energy with zero carbon footprint, and has access control restrictions built in so anyone who is a politician or bureaucrat cannot use it.

If you want the best idea, just look at the last paragraph and ignore everything else.

Entirely too many to write about here in entirety, but I'll write a few that I remember ATM:

A setup, so multiple devices, of: a ~~feature~~ phone based on flipper zero with buttons on it like it's a fidget toy (but actually functional) and a foldable tablet that looks like a notebook (Lenovo yoga fold)

A tablet based off of Pixel C, MacBook, ROG Flow Z13 and/or Pixelbook with magnets in the body to stick it anywhere like Google tablets usually have, the look and keyboard of Pixelbook (it's just a personal favourite), trackpad and SoC from Macs, gaming capabilities from windows, and a screen with the new 3D tech (for designing 3D prints), microLED, and 240 Hz+ VRR

A controller based on a combination of dualsense, xbox elite, and steam controller with a low energy display doubling as a trackpad in the middle

Screen tech which is capable of giving actual tactile feel of buttons so I can have double screen or foldable device without sacrificing on a keyboard good for touch typing.

A mixed reality headset as small as sunglasses with capabilities of the best of them

A headset which I can stick around my ear and get audio directly into my nerves with very little if any invasive surgery

Basically Nokia morph concept but in real life would also be really cool

While typing about magnets I remembered the actual thing I really want to exist currently: polymagnet based devices and accessories. It can be so futuristic if implemented properly, and a game changer, though I assume it's not mass production ready yet or someone would have applied it. Everything else is just my imagination running wild, not that I consider this a reasonable thing either.

iPod classic. Add Bluetooth, 1TB flash memory, and USB-C. Nothing else

I want a transmogrifier

Time machine, please

@OP The Motorola Atrix tried this a while ago, but it wasn't particularly popular with reviewers

This is really specific. But I have wanted it for years. A switch for two 3.5 mm sound. Basically plug two inputs into the box, have 1 output and a simple physical switch that would let me flip back and forth.

robot butler that does all my chores