SS is still used in many places though, the secret service is still a thing. SS is still used for ships even when they don't run on steam. I really doubt anyone would care about an Xbox SS.
Yeah but all those things have actual meanings
Ss in ships means "steamships", ss in cars means "super sport".
Xbox SS would basically be "Series S," where the S isn't an actual abbreviated word but a designation (eg lower than X). Doesn't seem the same to me.
I agree it'd make sense to keep the S designation because of the Xbox One S and not confuse consumers.
I just think Xbox Series X is a mouthful, so we'll probably be saying Xbox SX more often than not. If that's the case than Xbox SS just doesn't sound like a good brand image because its not really an abbreviation for anything coherent like a term/name/word.