1. It is SteamOS with desktop mode, the SteamDeck made me really miss that feature on any newer console i use like my ps5 or switch 2. Like even if we just limit it to games, playing games like The Binding of Isaac or Minecraft unmodded is a pain for me. Even just using websites for Streaming Services that dont have their app on every system ever, PS5 and Switch 2 dont even have webbrowsers you can just access, I think you have to edit DNS settings to make it think you have to sign up for a free wifi in the browser IIRC.
2. Wireless Streaming without the (Quest 3S) downsides of Wireless Streaming. I have a 6ghz router in my room, connected to my Laptop with an ethernet cable and tried the streaming on a quest 3S. I dont want todo that ever again, it was so inconsistent. It felt like the beatsaber song and gameplay speed up and slowed down like 1-5% in waves to catch up with the stream. Also sometimes my right eye turned into a chess grid of black pixels but i would assume that was more of a Linux Quirk. Also since i use a Laptop i dont want any wires from my headset to the Laptop, I dont want to pull my laptop and possibly more off my desk in the middle of a game. Also for movement games like beatsaber i find cables really annoying when you want to quickly accelerate.
3. Both the Windows mixed reality Headset and Quest 3S had TERRIBLE software. To continue using the WMR i had to reinstall windows like once every 1-2 months. Which just ended up with me stopping to play VR (Like why would i reinstall my PC like 6-12 times a year just to play those 3-4 games. From what i know from the steamdeck, the frame will be so so much better in this regard. On the Quest i wouldnt even have my steam library without connecting to a PC.
4. An ARM linux device that doesnt contain 10-15 year old somewhat mid phone hardware. Like i had been thinking about getting a macbook for asahi linux for a long time now just because it seemed like the best in that regard and i really really wanted a finished, high performance ARM device. And if i can run that many steam games on my non actively cooled phone already without the frame even being out (Since both use the FEX layer) (which has the same chip as the frame) I feel like i will really enjoy it for local Minecraft VR and Beatsaber and probably more.
5. The controllers. LTT complained about the "Default Xbox layout" because reaching all buttons is a bit hard, but for me, both the meta quest 3S and Samsung odyssey + controllers had a severe lack of buttons to bind game actions to. Also i like bigger controllers anyway, I like the Steam controller, I like the Wii u Gamepad, I like the steamdeck and I even like the OG xbox controller. To me those werent big clunky controllers, they were (or are) the most comfortable controllers i have used so far.
The only 2 things im eagerly waiting for more Info on is the "Much better comfort" i have been hearing about and the ability to install .APK files.
Either way im already sold on this thing and believe i will LOVE it for years and years to come.