Another vote for splitting MCU between movies and TV at the very least. In terms of how the fandom handles things, this is the split that makes the most sense to me:
- MCU movies
- Agents of SHIELD
- Agent Carter
- Defenders (including all the Netflix shows)

People might be in more than one of these at once, but my general experience with MCU fandom is that they're usually treated as separate within the fandom (though others might have different experiences).