I mean, you’re not wrong, and I am just entering middle age, and the stupid locks makes me pissy. I am completely fine with MIM parts, provided they’re executed well. I am guessing by now, that S&W has this worked out quite well, and I haven’t heard of large amounts of failures of their guns that can be laid at the feet of bad MIM parts.
But this whole thing with the lock adds complexity to the gun, removes mass from hammers, even if it’s just a little bit so they can engage with locks, and given that recoil can cause the locks to activate, makes the guns potentially less reliable, and it makes it harder to make the actions really nice. So I see several things that are worse, for as far as I can tell, almost zero benefits, given that a locking case or trigger lock gives the end user the same options but without nonsense that makes the gun objectively worse.