Yes, and there are two other points to follow up this one: If one ML solution is better than the other one by only 0.01%, in this context it is worth a lot. It

Yes, and there are two other points to follow up this one: If one ML solution is better than the other one by only 0.01%, in this context it is worth a lot. It is a winner-take-all type of situation. Edit: the second point was this: If one ML algorithm gives us a 1% saving and the other one gives us a 0.9% saving, you could say that is a 0.1% improvement or you could say that is a 10% (of 1% saving) solution. A percentage sign without context is not that meaningful.