Actually, no. What prompted this particular tangent is me saying there's only one way you can change to a more aggressive deco schedule during a dive without appreciably increasing your risk, and that is if your planned ascent schedule was overly conservative. And the point is that you weren't in deco to begin with.
What defines whether you are in deco or not, if it's not "what your computer says"?
As I said earlier, at early stages of dive training, deco is taught as a black-and-white, 0-or-1 kind of thing. But, in more advanced training, it starts to become clear that deco is a spectrum. What you decide is "in deco" may be "not in deco" to someone else, based purely on their training, and experience (including their experience with their own body).
"In deco" or "not in deco" really only has meaning in the context of the question "what does my computer say?" Then, the answer is yes or no. if you change your computer settings then the answer may change, but what's going on in your body hasn't changed.
If the question is "am I going to be bent if I go straight to the surface", the answer is never really yes or no. It's more like something like "very unlikely, probably not, maybe, probably so, or almost definitely." Or somewhere in between or on either side of that.
Anyway, regardless of what prompted you, I was responding to:
Hopefully someone reading it will realize how idiotic the notion that, after you're over the "safe" M-values, you can "re-calculate" yourself to be under them again, is. In which case my post was not in vain.
This post implies that selecting a computer that won't lock you out is idiotic. I disagree. You still haven't explained what the "safe" M-values are, versus the "unsafe" ones.
In the original example of the many things you can do to upset a Suunto computer, I can easily imagine some of those to be innocuous enough that a different computer would still get you out with a VERY high degree of safety (i.e. low probability of DCS). It seems to me to very similar to the idea of diving GF30/70, then looking at the computer surfacing gradient and electing to omit the very last portion of prescribed deco, in order to get out with a surfacing gradient less than 80. It may be higher risk, but is the difference meaningful at all? Any more meaningful than ignoring a Suunto that got upset by some very innocuous action and following the non-Suunto that is on your other wrist and is not demanding deco?