Email is often the right interface
A small business owner should not need to remember another login just to change hours or add a service.
Email creates a clear record: what changed, who asked, and when the update was requested.
Set boundaries
Email updates work best when the plan defines what is included: one routine edit per month, extra edits at a known price, and separate quotes for larger changes.
That keeps the service fast and prevents dashboard-free from becoming scope-free.
Keep ownership clear
The business should still own its domain and approved content. The provider can handle the technical work without trapping the owner.
A clean cancellation and handoff policy matters as much as the update process.