True, there is nothing more for you to say. You've got a lot more reading to do before. You might want to consider that Luxfer tanks are burst tested to 2.5x the service pressure. That's 7500 PSI. The DOT test pressure is 5000 PSI and they are cycle tested at service pressure 100,000 times.
Would I get in the habit of over filling an AL80 to 3800? No. Does it happen from time to time? Yes. It it a recipe for instant death? Typically not. Will it shorten the life of the tank? Some. Hydro every 5, inspection annually is enough to make the odds really really good that you'll be fine.