It's not that I don’t want my private life to seep into work, it's that I don't want work to seep into my private life.
So I don't need friends that are also colleagues or clients. I already have great friends. I'm a great colleague in every way possible, but I never feel the need to be anything more than that.
For most people work / life balance is already tipping towards work. They want it to be the other way around.