I didn't mean stat met is irrelevant, just what percentage you are using is irrelevant. What matters is can you make the plan work and how risky is it?
An ETA using current GS is not useful, especially if you are turning into a 100kt wind, I am surprised it doesn't use the current wind vector. What does it use to calculate the AP?
It would be good in the future to get both systems side by side to develop a single MPS using the advantages of each system to arrive at a single product for all users. Chances of that happening are remote though!