The new search module replaces the native search functionality in WordPress and Jetpack developers claim sites with a large amount of content, images, or products will see significant speed improvements and more relevant results.

I'm not sure how I feel about this. It's generally agreed that WP's built-in search is not good. Is JetPack now the solution for defects in WP core? Is anyone now going to address WP's search problems, or is that now a fixed problem?

How much do we want "install JetPack!" to be the solution to "parts of WP core are bad" ? With both core (i.e. WP foundation) and JetPack having the same ultimate leadership this just feels very uncomfortable.

To make the concern clearer... we know that plugins are for adding features. There's no problem that JetPack adds features that core does not have. But "more relevant results?" and "speed improvements" ? Those are arguable fixes for core defects., not new features.