Honestly I think 10 is a slightly overwhelming number to keep track of everyone every day as it is. It's one thing on weekends when I have as much time (in this pandemic world anyway) to play and talk to villagers and do all my shopping and chores, but on weekdays when I've still got to put in an 8 hour work day, 10 villagers feels like a lot to keep track of. When things start to go back to normal, that will only be more the case as social lives and extracurriculars start back up.