What problem does this address?

Now that we have the Interactivity API in Core, it's time to start experimenting with enhanced user experiences. One of these would be the ability to refresh the content of a Query block without refreshing the page while the user is typing a search.

What is your proposed solution?

I believe the simplest way to start with the Instant Search would be to convert the search into an instant search when the Search block is inside a Query block that has the Forge Page Reload option disabled.

When the Force Page Reload option is disabled, the enhancedPagination attribute is true and is passed via block context. Therefore, the Search block can subscribe to the enhancedPagination context. If it is true, it can add the necessary directives using the HTML_Tag_Processor and enqueue de view file.