Same perks and disadvantages apply on all platforms Steam collect data from. My guess Valve do apply some weird AI algorithm to determine missing data. IE (just speculation) if there are Steam Decks that never go in Desktop Mode the algorithm pushes itself more widely in the array of the SDs that do.
One thing worth to remember, Valve always knows which binary executable connect to their server (and today very few use Steam’s windows .exe through WINE), the survey is just them asking permission to eventually use your data: is not a commitment, they can fix/screw the statistical data anyway they see fit… I think mostly to fight those who cheat with the stats… Chinese language jumped few time over English (making English a secondary language on Steam) and Valve “fixed” those published data too!