I don't think it's terribly wrong. It will generate the desired entries (internally) and proper reports, if you add the appropriate option (--forecast=... for hledger, something else for Ledger). Or you could use it once to generate permanent journal entries, in your main journal or a forecast journal:

  hledger print --forecast='2024-11-01..+3 months' >>$LEDGER_FILE

Effective dates are another solution, but IMHO a misfeature, I mention this for newcomers: https://hledger.org/hledger.html#secondary-dates