Thanks for the detailed feedback – it’s always useful to hear, and I’ll pass it on :)
One small feature you may not be aware of: on our website, Splitwise does allow you to add group members without email addresses, which hopefully helps for the “large party” scenario. My apologies that the same feature isn’t available on our mobile apps!
An error occurred while saving the commentNicolas Ross commented
Still no fix for this. On the website we can't add a friend without email.