Overall length of the 38 super limits it to the bigger pistols like 1911s and such they are to long to go into a high power, or 9mm sized grip frame. The 357 sig 40 S&W 45 gap are shorter cartridges to fit in a 9MM grip frame.
The 1911s in 38 spl are only capable of wadcutter loads only do to overall length.
Every one is so concered with capacity, safe action / double action and most of these wont allow the super. By a lot of the tacti crowd today cocked and locked is obsolete and unsafe. a 6-8 round pistol is obsolete. I have worked with the super for years in several 1911s. the federal Hydra shock load is effective on game animals. The few safety slugs Ive used were also very destructive. It is easy to load for, easy on powder. Shoots softer than some. Mine have all been accurate pistols.
Another plus to the super is on the range I dont have people trying to grab my brass LOL.