Using SA profile as-is or just reducing its height is a poor choice, ergonomically. It will slow down typing and reduce accuracy.
While quite probably true, it is true in the most irrelevant sense, at least for me (and probably the vast majority of folks).
I touch-type nearly 90wpm with enough accuracy to get by quite nicely, even on SA keycaps and today's straight switches and plates. There is nothing in the way of ergonomics that would be so beneficial to me as to warrant a complete change to the profile, and in fact, I'm so used to it by now that anything which strayed too far from it would probably feel weird and uncomfortable and would keep me away from it. I doubt very many people would care or notice the so-called ergonomic benefits of a "properly" sculpted profile.
IBM designed their beamspring keyboards for an era when being a typist was practically a profession in and of itself. Outside of coders and bloggers, nobody types for a living today, and those that do don't need a few more WPM to make their jobs easier or lives better.