The useful distinction is whether the behavior should survive a visual redesign. Presentation and persistent site behavior have different lifetimes.
Ask what must remain
A custom content type or an integration may still be needed when a theme changes. A decorative arrangement of a post header is more closely tied to presentation. List the feature outputs before deciding where the code should live.
Consider ownership
Record who will maintain the feature and how it will be updated. A small custom plugin still needs clear naming, configuration, and a removal plan. Moving code does not remove the responsibility for testing it.
Test a theme switch
On a development copy, change the theme and check whether important data remains accessible. This reveals accidental dependencies early. Document any styling needed to make the feature look right in a different theme.
Ask what should survive a redesign
If the behavior is essential to the site’s data or business process, it should not depend solely on a visual theme. If it only controls presentation, a theme may be a natural home. Write down what a future theme replacement should preserve before making the technical choice.
Check ownership and failure modes
Identify who can maintain the code, how it is tested, and what happens when the feature stops working. A custom plugin can be portable but still needs an owner; a theme feature may be convenient but tied to one design. Compare the actual maintenance commitment, not just the label.
Document the boundary
Record where the feature lives, what data it changes, and how to test it after an update. Keep a small acceptance checklist for the user-visible behavior. This helps the next developer understand the decision and prevents a redesign from accidentally removing an important workflow.
An example to adapt
A color treatment may belong with the visual theme, while a redirect that protects an established URL needs to survive redesigns. Treat these as starting examples only; identify who owns the behavior and what should remain after the theme is replaced.
Put it into practice
Choose one step from this article, try it on a representative project, and record what you learn before changing the wider workflow.
This is general editorial guidance rather than a hands-on product test; verify platform-specific details in current primary documentation.
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