It gates the flag the forecast publishes, so a surface asking whether the
history supports a weekday claim about THIS comparison asks one place.
It does not retro-gate the weekday board the insights page has carried
for releases — that board is built from the entry aggregates and has its
own floors, and hiding it from accounts under ninety days would take a
surface away from people already reading it to enforce a rule about a
different calculation. And it does not justify building a second one.