Speaking for the non-scientist metric challenged populations of the world, I can easily calculate whatever I need. And I actually do know how to make use of 1g = 1 ml = 1cc. Can I actually visualize those in my mind? No, I can't.
Why do I always make sure I know the height in Feet of any target Summit? The Topo map I will have with me indicates contour lines in FEET. Go figure. If every reference to Feet was removed from the Database, I think American SOTA activators could deal with the conversions. And I suspect there might not be much fuss about it. Go to the Find a Summit feature of the Database. Meters and Feet are both listed. Then click to view extra data - where did the Feet go? No big deal.
Now lets discuss parts of the world who hate the way the US presents calendar dates. There is a very popular US west coast recreation focused company with a world wide mix of customers. What is one of the points many of the non US customers hammered them on? Calendar dates. And that isn't even a conversion. It only requires a simple rearrangement of the order. You would have thought they had been asked to raise the Titanic instead.
If Summit elevation in Feet is not there, I will calculate it. If elevation in feet is there, I will check it. I am just glad I can look up whatever is there. If it is listed there, accuracy is appreciated. Where there are known issues - they eventually get fixed. Thanks.