What ARE the GFs used by computers that have a lockout feature? Some aren't Buhlmann, so who knows. Regardless, these computers generally allow a diver to set a conservatism level. If a diver sets conservatism to high and then does not dive so conservatively and messes up a deco stop and gets locked out, I would say that should be no surprise to the diver. That diver has made their own decision regarding their safety, just as you do with a computer not having a lockout feature.That's all relative.
All these computers will lock you out, regardless of how much deco you missed.
Why would you be in danger if a computer with GF of 20/60 locks you out for 1 minute of skipped deco? While you could be clear doing the same dive on GF 30/70, hell you could even be NDL the whole dive.
I prefer to make my own decisions regarding my safety.