The question
When a query gap warrants a brand-new page rather than an edit to an existing one.
You have found demand for a query and are deciding whether to build a new page.
Why it matters
Teams default to creating pages, bloating the site, when an existing page could have covered the query.
How to decide
IfNo existing page targets the intent and demand is valuable
ThenYes - create a focused new page.
IfAn existing page is close and could reasonably cover it
ThenNo - extend or re-angle that page instead.
IfAdding it would duplicate or cannibalise a current page
ThenNo - it risks cannibalisation (see Should I merge these pages?).