How can agencies running 10-50+ WordPress sites get reliable infrastructure without becoming hosting experts?

https://www.jelly-bookmarks.win/free-migrations-that-actually-save-billable-hours-a-practical-guide-for-agencies

Which specific questions will I answer and why they matter to agency owners and ops managers? Running dozens of client WordPress sites brings predictable headaches: uptime incidents, plugin conflicts, slow builds, client billing disputes,