Cimarron has it right on the shorty .45ACP 1911s. Colt Officers model and the Para Ordnance are classic examples.
Both have had ammo or reliability problems in their long histories.Colt's usually need a trip to the gunsmith and stll may not work 100% reliably.Para introduced the Hog series, got nowhere with it for the most part, and then reissued the gun after warehousing most of them for a year or so.
Trying to get a compact 1911 gun to function well in.45ACP or other large caliber is a dicey prospect.
Engineering parts and springs strong enough to do the job and do it reliably are major hurdles to overcome.Mass and weight of particular parts has to be taken into account too. Downsizing things does not change the physics that have to be overcome. There is a law of diminishing returns at work here.
I am not saying that it can never be done, but there are lot of trade offs when going from a large pistol that has been engineered well to be reliable down to a much more compact version.
Since Taurus has reliable DAO pistols out there, why go through all the headaches to try and have a SA compact or subcompact that is going to be a headache in many ways?
DAO and DA tiggers usually have a little more whack to give a primer over SA triggers. There are exceptions.