It has become very practical / doable in the recent year or so. In my experience, if you have lot of frontend web experience, the easiest way to ship a RN app is by using Solito [0]. Also check out Nativewind [1] which allows you to style native apps the same way like you would on web. I was able to ship the first version of our app in about 1.5 weeks with this stack. Also checkout Tamagui [2].
Solito seems to let you share component code, but I assume that it does not share data fetching code? It doesn't do SSR for the native app? And in expo you'd be expected to `fetch` or otherwise get the data yourself (compared to next land where you can just use the next data loading stuff)?
[0] - https://solito.dev
[1] - https://www.nativewind.dev
[2] - https://tamagui.dev