I think this is the explanation, I usually only find myself wanting to temporarily "stop" Vim and do something on the shell for quick one-off commands that are

I think this is the explanation, I usually only find myself wanting to temporarily "stop" Vim and do something on the shell for quick one-off commands that are fine in a subshell - not to keep a backgrounded Vim instance around for longer than that. The blog author seems to have a different use in mind.