We maybe still need plt-scheme, but I'm asking if we need that tag on the new questions. E. g. it would be ok for Abstracting functions / avoiding repetition in functions to have racket (or maybe better racket-language?) and optionally scheme, because plt-scheme refers to the language from which Racket has grown – With the release of version 5.0, PLT Scheme was renamed to Racket.
UPDATE: We now have the tags synonyms "plt-scheme" and "drscheme". Thank you, thank you, people, thank you. I'm glad you helped us with votes. Thank you very much. :-)