Concern about revealing plot details has become a substantial cultural norm, enforced socially and managed professionally with secrecy operations that would suit a defence contractor.
It has also changed what gets written, and that effect is worth examining.
The research is less supportive than assumed
Worth starting here because it undercuts the premise.
Studies examining whether knowing the outcome reduces enjoyment have produced results that surprised people. In several experiments, participants who were told the ending reported equal or greater enjoyment than those who were not.
Proposed explanations include that knowing the destination allows attention to shift to craft, and that reduced uncertainty makes a story easier to process.
The findings have limitations and have not replicated uniformly, and the strong version of the popular belief — that a revealed ending ruins a work — is not well supported.
Which fits with ordinary experience. People rewatch things, and rewatching is not diminished by knowing what happens.
What the norm has produced in the writing
Here is the more interesting effect.
If the twist is the value, the incentive is to construct stories around twists.
Which has produced a visible increase in narratives whose primary pleasure is a late reversal, and a corresponding decline in stories that are satisfying when you know where they are going.
A story built on a reversal is frequently unrewarding on a second encounter, because the thing it was for has been used.
Whereas a story built on character, texture or theme survives repetition, which is the property that distinguishes durable work.
The marketing consequence
The commercial version of the same pressure.
Secrecy is now a promotional strategy. Withholding information generates speculation, which generates coverage, at no cost.
Which means the industry has an interest in maintaining the norm, and campaigns are built around the idea that something must be experienced unspoiled and immediately.
That urgency is commercially useful, since it drives opening weekend attendance, which is exactly the metric the industry most wants to move.
The audience enforcement of spoiler norms is therefore doing marketing work, unpaid, which fits a broader pattern.
The trailer contradiction
Worth noting because it exposes the inconsistency.
The same industry that demands secrecy routinely releases trailers containing substantial plot information, including in several notorious cases the ending.
Which suggests the concern is calibrated to whatever serves promotion rather than to protecting the experience.
Some filmmakers have pushed back and produced deliberately uninformative marketing, and it works when the name attached is strong enough to sell tickets without it.
What is genuinely worth protecting
A reasonable position rather than a dismissal.
Surprise is a real pleasure and revealing a major development to somebody encountering it fresh is inconsiderate.
The reasonable norms are about timing and context — not announcing it unprompted, not putting it in a headline, giving people a period after release.
What is unreasonable is indefinite protection, hostility toward discussion of work released years ago, and the assumption that everybody's experience must be identical.
Works from decades ago are discussed openly by any sensible standard, and the boundary is a matter of custom rather than principle.
The critical consequence
An underdiscussed cost.
Serious criticism frequently requires discussing what happens, because what happens is what the work means.
A norm that prohibits this makes substantive criticism impossible in the period when it would be most useful, and pushes reviews toward evaluations of atmosphere and performance.
Which is part of why so much release-week coverage says very little, and why the interesting writing about a work appears months later when nobody is reading.
Where I have landed
Reasonable discretion for a few weeks after release, particularly in headlines and unprompted conversation.
After that, discussion is legitimate and the burden shifts to anybody who has not yet seen it.
And a general scepticism toward works whose entire value is a reversal, which is a preference rather than a principle and which has served me reasonably well.
The secrecy operations
Worth describing because the scale is genuinely unusual.
Major productions use fake titles on call sheets, watermarked scripts distributed page by page, non-disclosure agreements extending to background performers, and in some cases scenes shot with alternative outcomes so that the cast do not know the real one.
The cost of this is substantial and it is spent on protecting information that will be public within weeks.
Which is a reasonable indication of how much commercial value the industry places on the norm, and therefore of how unlikely it is to change.
The rewatch test
A practical way to assess whether a work depended on its surprise.
Watch something a second time, deliberately, within a few months.
If it is richer — if you notice construction, foreshadowing, performance choices that were invisible the first time — the surprise was decoration on something substantial.
If it is inert, the surprise was the content.
That test has changed what I recommend to people, since the works that survive it are the ones worth somebody else's time regardless of whether they already know the ending.