What problem does this address?

Currently, there isn't a way to save drafts or schedule changes to the site editor experience. Right now, this is an option with the customizer and can be super useful when overhauling a part of the site but wanting to wait for a quieter traffic time to launch changes. Here's what it looks like in the customizer:

This came up as part of the FSE Outreach Program's second call for testing. Of note, this touches a bit on what's raised in this issue as well with saving template drafts but it felt important to separate out this concept into its own issue: #27905

What is your proposed solution?

Allow for an option to schedule changes during the saving flow in the site editor.