and no longer use .45ACP as my primary SD caliber because there are a better choices.
I'd substitute the word "other" for "better" in the language, and then pick choosing to carry other calibers as "primary".
When I became a young cop I was already of the opinion that .357 Magnum and .44 Magnum were better overall choices for defensive calibers than .45 ACP, but I'd owned a Colt Commander since the early 70's, and continued to carry one or another as an off-duty weapon as young cop. I did, however, continue to carry both issued and personally-owned .357 revolvers on my own time, and one or another .44 Magnum, clothing & activities permitting. I remember carrying my Magnum revolvers more often than my Commander (or later Star PD).
I still own 9 pistols chambered in .45 ACP, but only 6 guns in 9mm and 5 guns in .40 S&W, so I still like my .45's.
I just don't carry them as often, although I do spend just as much range/training time with them as with my other calibers.
I finished my career carrying an issued .45, but that was primarily because someone else had really wanted to carry the .40 I'd been carrying, and since we didn't have anymore of them in inventory at the time, I arranged to trade issued weapons with him, taking his .45 in exchange for him getting to have the .40 he wanted.
A little later I turned in that issued .45 (still carried due to becoming a reserve upon my retirement from a full-time peace officer career) ... for a 9mm, because I happened to like that slightly smaller & lighter 9mm better. Then, a little later I turned in that 9mm for a new .40 (transitioning to a different model guns). I didn't choose the slightly larger .45 available, and the available 9's were in high demand, so I just accepted a .40 and called it good.
Even though I'm a long time .45 ACP aficionado, owner & shooter, I'm not exactly a caliber snob.
My time, training and experience as a cop, who has also served as a firearms instructor since '90, has pretty much changed how I view "caliber effectiveness" as a primary factor when it comes to caliber selection for defensive handguns.
Nowadays? My "primary" caliber selection for off-duty/retirement CCW is most often either a .38 Spl or .380 ACP ... followed by one or another of my subcompact/compact 9's/.40's, if I feel the need for a belt gun, and sure, sometimes one of my smaller & lighter .45's.