If you bolt to the surface at deeper depths, there is a greater chance of getting bent. I don't care what PADI says about stops being optional, you make bubbles and they come out. It's harder to breathe at depth, and if you get stressed out and start hyperventilating you can get into a cycle of overbreathing your regulator and it's very hard to stop. You're not venting the CO2 from your lungs and you could pass out and drown.