The domain is a business asset
Websites can be rebuilt and hosting can be moved, but losing control of the domain can interrupt the website, email and many connected services at once. Registration details therefore deserve the same attention as other important business accounts.
Avoid ownership tied to one person
A domain registered only through an employee, freelancer or old agency can become difficult to manage later. The business should know the registrar, have access to the account, keep recovery information current and understand who can approve changes.
Renewal is the simplest risk to remove
Keep contact details valid, enable appropriate account security and track renewal dates. A few minutes of administration can prevent a surprisingly disruptive problem.