I think it depends on the person.
I've been throwing my equipment on over my head since my first open water dive.
It's easier for me to do it that way than for someone to help me.
I've dove alone quite a bit, just have to make sure you don't run out of air or put yourself in a stupid situation.
I've been on dives where I was running very low on air, and decided to just run out and grab someone elses alternate, for one reason or another (and please don't tell me that you think I am irresponsible, because I'm very responsible), point is, I wonder what would have happened if I didn't have that alternate to grab onto, probably would have had to ascend before I was ready.
I'd say it's up to the person, but that person should think about it first.