I was a S&W fan before I was a Ruger nut, I never jumped ship, more like I just bought a 2nd ship for my Ruger revolvers!
All "locks" aside, people complain about MIM parts, which is a form of casting.......well, since the beginning Ruger has cast most of the metal parts used in their revolvers, frames, hammers, triggers, etc. and have been doing this since the 50's in the Blackhawks, since the early 70's for the Security Six series, and now for the GP100 and it hasn't stopped these guns from becoming wildly popular.
I have over 20 of each, I'm more of a fan of well made American revolvers so I'm a huge fan of both Smith and Ruger. Never had much use for any Colt stuff but I do have a few of those too....the King Cobra has "sintered" parts but that doesn't stop people from paying $800 for those now

I think some people would pay $500 for a piece of cow dung as long as it had a Rampant Colt stamped in it.....
I don't have a Ruger LCR but sadly, I believe it has a lock under the grip and I think a few of their other new designs have a lock

The day they start putting locks on GP100's and Blackhawks will be a sad, sad day in the revolver world for sure, let's hope that never happens.
If someone likes the new S&W designs but hates MIM and IL, get the "Plug" and track down a hammer and trigger set from the short era when Smith went to the frame mounted firing pin but still forged the internals......problem solved.
As for me, I have many rounds on my 64-7 and 617 and both are still tight as a drum, so the MIM parts should work well enough for me. The day it fails on me I'll be sure to report about it!