You are still misunderstanding the difference between
accuracy versus
precision, and overestimating the level of accuracy that any dive computer is capable of providing. Depth fluctuations are just one factor in determining gas loading. Sure a computer can sample depth every second and integrate that over time, but so what? There are so many other variables and unknowns that the margin of error is
huge; you're missing the forest for the trees. The profile that a dive computer will generate for you is still fundamentally suboptimal (i.e. inaccurate) in multiple ways. I am not a particularly skilled or experienced diver, yet I learned how to do this stuff with just a little practice; anyone who cares to try can do the same. I'm not "getting away" with anything.
Look, I understand that technically-minded people want to believe that there is a "right" answer and that problems can be automated away. But the reality is that no one fully understands how decompression works and the mathematical models are fundamentally not accurate enough to be useful in the midst of a dive. Better to accept a certain level of uncertainty rather than believe a falsehood. Free your mind.