The trouble with the SurfGF/GF99 numbers shown by dive computers is they are a very narrow view. It comes from just the leading compartment. Other compartments are hidden, thus the first dive of the first day on x/95 and the last dive of the day a week later will have different risks for the same Indicated GF. This is the same mechanism that has been used to show excessive deep stop profiles are bad. The extra loading on slow tissues becomes an issue with repetitive dives too, but the one leading tissue is used to generate the single number which is supposed to represent risk.
I am absolutely not saying tables and silly rules are better than a live computer. I am saying that using an indication like SurfGF instead of safety stops is a mistake.