NovStructured data should not tell a richer story than the page
Schema markup is useful when it represents visible, supported information—not when it adds claims that the user cannot verify on the page.
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Structured data can feel like a private layer for search engines. That makes it tempting to say more there than the visible page is prepared to support.
I avoid that.
If markup contains a price, rating, author or status that the reader cannot see or substantiate, the implementation may be syntactically valid while being semantically wrong.
A source-checked developer profile is a good example: schema can repeat supported information from the page, but it should not silently turn cautious wording into a stronger claim.
Markup should consume the same facts as the interface
The safest implementation is one where the visible component and structured data read from the same underlying field.
Problems appear when the hidden layer acquires its own defaults and exceptions. A template keeps using an old property. Missing data is replaced with a convenient value. A page type inherits markup that belongs to a different entity.
At that point the code can describe a cleaner, richer object than the user-facing page actually contains.
I treat structured data as another representation of the content model, not as a separate promotional channel.
Missing data is allowed to be missing
A schema template does not need to fill every possible property. If there is no supported rating, do not manufacture one. If the page shows a range that depends on unit choice, the markup should not pick a single convenient number just to populate a field.
The same principle applies to authorship, availability, dates and status. Unknown values are safer than confident placeholders.
Conditional rendering deserves particular attention in shared generators. One incorrect condition can add a misleading property to an entire class of pages.
Validation is necessary but incomplete
A validator can catch malformed syntax and structural problems. A successful result still does not answer the editorial question: does the markup accurately describe what a person can verify on the page?
After template changes I compare both layers. What does the page say? What does the structured data say? Are price, status, name, author and date interpreted the same way? Did a hidden field remain stale after the visible component changed?
The strongest markup is not the most ambitious. It is the version that describes the real page accurately and stays in sync with it.