Valve is creating a Steam Deck API for devs to quickly optimise games
https://www.pcgamer.com/valve-steam-deck-api-optimisation/
Valve is working with AMD to ensure Steam Deck is chill with Windows 11
https://www.pcgamer.com/steam-deck-windows-11-tpm-compatibility/
Sounds like by the time it launches, installing Windows shouldn't have any issues
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850