The 256GB and 512GB Steam Decks come with some digital rewards, such as an exclusive steam profile customization bundle and a unique virtual keyboard (keyboard is 512GB only). Previously these rewards were not available to refurbished deck buyers, but Valve plans to change that and make these rewards available regardless of whether you buy new or refurbished.
Even if your MacBook Pro has a removable SSD, it’s probably too long for a Steam Deck. You need it to be in the 2230 form factor
The 2016 MacBook Pro does not use the standard size ssd. I’ll double check, but Im pretty sure it’s the correct size.
Nice! Always happy to be wrong about bad news