Notion has been a solid A- for shared to-dos, bookmark lists, recipes, trip planning details, etc, which covers most of our shared lives. The main issue with Notion is that mobile syncing can be very slow when we're out in the world, so using it to distribute a shopping list while we're at a grocery store, for example, has been unreliable.

For actual scheduled events, we just share our personal Google calendars with each other and invite each other to mutual events. No issues there.

The largest technical issue currently is just organizing personal media in a reasonable way. We're in the in Apple ecosystem so shared albums have generally worked for photos and videos, but it's clunky at best and doesn't cover other media or documents.