While I can understand how someone could easily become frustrated by what they feel is insufficient QC efforts, sometimes expectations and perceptions might be unrealistic for the circumstances. BTDT.
Aluminum frames, even alloyed with a bit of Scandium, are still softer than steel. It's the nature of the beast. Black finishes on aluminum are always going to make scratches, gouges, nicks, dings & such more visible because they can go through the dark finish and reveal the plain metal color. Light anodizing/finishes on aluminum frames are going to blend better with the normal metal color make the the scratches & developing wear less obvious.
Also, trying to compare a hand-crafted 1911 made by a custom gunsmith, focusing whatever attention & time they want to spare, is different than assembling & fitting one that's mass produced ... and such a comparison is perhaps not quite fair mass production maker, and maybe not a little unrealistic.
I bought a SW1911SC 5" stainless slide/plain finish back about '05. The top of the right aluminum frame rail had a nice 'nail nick' depth groove running lengthwise along the middle of the top of the rail.

A closer inspection made it seem as though a burred spot on the steel slide's rail edge probably cut the groove during production and test-fire. This gun cost me just under $700 NIB, though, and wasn't a hand-fitted PC 1911 that cost over $2300.
As I'd bought this gun for a working/training tool, and looked at the deep scratch as a cosmetic annoyance more than anything, I didn't bother returning it and started shooting it. (To be fair, the hammer & sear engagement were textbook on that gun, easily matching the engagement I'd found on my Colt XSE, which looked excellent when examined under the magnifying scope 1911 armorer's widget we kept at the armorer bench).
Several years later the plunger tube staking became loose at one end. I don't mind staking steel frames, but I decided to take advantage of their warranty on the aluminum frame and let them replace it. I had enough other things to occupy my time as an armorer, anyway. When I got the gun back I could tell the repair tech was probably someone familiar and experienced with 3rd gen guns, as the repair tag said they'd replaced the 'sideplate'.

Good repair, though.
I still chuckle when I clean and lube the gun and see the long scratch along the top of the right frame rail. Kind of looks like a bit of gravel got caught up in the works one day.