Zois shouldn’t appear instantly when you call them, as if they didn’t have a life of their own. It’s not realistic for them to show up immediately.
Additionally, characters should get tired if they run all the time, meaning their energy should gradually decrease. It’s not normal for a Zoi to run across the entire city and never get tired.
I’d gladly do without this kind of realism 
It happens to me far too often that I invite people who can’t be reached/don’t want to make plans with me, waiting for them to finish conversations with others, etc.
A bit of healthy realism is fine, but this is a game, I want to tell a story, not something that makes it more complicated for me.
We need a toggle button. Realism/custom settings. We all want to play the way we want and there’s no one rule for everyone.