No. If a work is completely new, than a spoiler warning is good, for a limited period of time. As I mentioned, 6 months to a year seems fair. However, a related work adapted or derived from an original seems excessive. In this case, some discussion of details might be served by a spoiler warning. However, the basic story of the Demeter is given in Dracula.
I don't believer people should be restricted or shamed into not discussing works that are years old. In all cases, someone has not seen or read the original. It doesn't matter how famous it is. Polls have been conducted that significant numbers of Americans have never heard of Superman. I knew someone once who had never seen Disney's Sleeping Beauty 29 years after its release.
This is a movie discussion site. We come here to discuss movies. We shouldn't have to wait months or years (or never according to some people) to do so.
If you(generic you) are going to come to a forum specifically intended to discuss works, its your job to avoid discussions which might spoil your enjoyment.
Author of the Sodality Universe
The Road from Antioch
In the Markets of Tyre
Flight to Lystra
The Theater at Ephesus (coming soon)
The Council on Jerusalem (coming late 2023)
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