I don’t know why this is so hard for Ruger. I got a new model Blackhawk in .45 Colt about a year ago. Shot way high like yours. Only way I could get it near the bullseye was with 180 grain bullets which sure isn’t what I bought it for. My gunsmith charged me an hours worth of his time to build and install a new patridge site that actually works.
For the same reasons your 45 probably has tight, inconsistent throats, and
many have the barrel screwed so tight there is a barrel construction.
Most costumers won't notice.
They have never had competition in the SA business,
So those who care just buy a Ruger and fix the F ups.
Ruger is in business to sell guns.
Not to make the best guns they can.
Proper throats, barrel constriction and sights that will work
with the most popular loads for the gun aren't much to ask.
Or expensive for them.
Not even a per gun thing.
Engineering and tooling.