Even galvanized will rust together. I like brass valves but PVC everything else though i like the black plastic non potable line but make sure you rigid Mount everything. Drive a fence Post or rebar or.... and tie the plumbing to it as close to the valve as you can to keep it from flexing as much as you can. This will give it the most longevity vs anything else including material choice.
The memory card ..... It was originally designed to even allow gaming on the card like a mini gameboy when disconnected. By now it would be. A steam deck that acts as a controller.... Huh reminds me of the vita.......