I'm an old-timer very much used to good old forged steel pistols. I know that Ruger has been making investment castings of pistol frames but I guess a cast revolver cylinder, hammer, and a few other parts are a bit too much for me. Anyway, I've never had any special attraction to the Ruger pistols and in general, I don't like revolvers. Never owned one. Apparently, in the case of the OP's pistol they completely missed that surface flaw. That pistol looks expensive to me so it's outrageous.
I doubt that the Ruger cylinders are investment cast.
In any case, Ruger has been manufacturing their single action revolvers this way since the mid 1950s.
That's around 62 years.
I would guess that they must be a quality product despite your misgivings, if they have survived this long.
Also, since I'm in my 60s, I qualify as an old timer myself, and I like them.
But, to each his own.
The OP's pistol may not be inexpensive, but mainly that's because it's from the S&W Performance Center, and has a certain amount of add-ons and extra work done.
The basic S&W .45 ACP model that it's based on sells for about the same price as a Ruger SR1911 .45 ACP.
In order to reach that same basic price point, it must use similar construction techniques that the Ruger uses.
That means that, like the Ruger, it must have some investment cast parts, like the hammer.
I doubt very much that S&W would use a forged steel hammer in the Performance Center upgrade and not in the standard model.
The safety looks like it is investment cast as well, judging by the photos.
S&W should have rejected that hammer, but that's the world we live in today.
If the OP is unhappy, then he should by all means go through the onerous process of having it replaced by them.