Feedback Beats Speculation
When every pull request gets a live URL, design and product can review real UI instead of screenshots. Bugs surface before merge, not after production.
What Good Previews Include
Isolated data, feature flags matching production defaults, and auth that works for reviewers. A broken login on preview kills adoption of the workflow.
Guardrails
Expire previews automatically, protect secrets, and never point preview apps at production databases. Speed without isolation is risk.
Culture Shift
Require a preview link in the PR template. Merges without a reviewed preview should be the exception, not the norm.