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Both apps mainly use downloaded/"offline" preprocessed map data in their own formats.

MVT format vector tiles are not remotely suitable for navigation or search (not ruling out that something could be hobbled together, but it would be a bit of a stretch).

There can be no one ultimate map app because use cases differ. For example, OSMAnd has many power-user features that are very useful for people who also contribute to OSM, but would only clutter the interface of an app for normies.

At the very least I hope it means they can share map tiles between them so I don't have to use gigabytes of space on the same map

No it doesn't.

There is Organic Maps already.

And it works really well. The smooth zoom in is amazing.

How so?

The fantastic offline routing and metrics of OSMAnd placed into a lightweight and snappy OrganicMaps interface would be a huge win for me.