Well you may be right and Valve may only be aiming to support some of the already-existing handhelds out there that are ARM based.

Valve does know how to play the long game on support, so time will tell.

I could see a budget Deck with an ARM processor, but I still doubt the flagship model wouldn’t be x86-64

Did you check the Discover store?

Also, Steam Link is another easy option for remote control.

Edit: https://www.gamesinhand.com/post/use-your-phone-to-control-your-steam-deck

He’s a Goder. Like a Witcher but for the heavens.