The world of SIA and SDG is a very, very different world to that of classical analysis. If you think that they "should not produce different results", then (a)

The world of SIA and SDG is a very, very different world to that of classical analysis. If you think that they "should not produce different results", then (a) you're either wrong or incredibly optimistic regarding our ability to carefully rephrase the statements of classical analysis in a way that works constructively. (b) what would be the point of a harder-to-use system that offers exactly the same results, anyway? The whole reason I find SDG interesting is that it will eventually be simpler to use, and because it provides an entirely fresh of the number line.