I don't think it's just about collisions, in fairness. There's also the aspect of managing user permissions by schema, searching for tables, and so on. Obviou

I don't think it's just about collisions, in fairness. There's also the aspect of managing user permissions by schema, searching for tables, and so on. Obviously this only becomes super-useful in pretty sizeable projects, but I tend to consider using schemas a good habit to be in.