What do all these network booted devices do? What do they do better than an SD booted device? > you can change what OS a Pi boots into just by renaming a symli

What do all these network booted devices do? What do they do better than an SD booted device? > you can change what OS a Pi boots into just by renaming a symlink. Just to be clear, this is the symlink on your server right? Is there any advantage in doing this other than convenience of not having to go around your house and individually change out the SD cards of each device? I've got a bunch of Pis around my house too, but they're just gathering dusk ;) I had all these grandiose ideas, but something, something ADHD.