It seems as though the evidence has shown (or, rather, suggested) that only the ultra-light framed guns have EVER done this, and it was under HEAVY recoil, and even then it was a rare event.
For most folks who have dissected the discussion, opinions, small bits of evidence and attempted to look at the whole thing objectively...
...there are certainly reasons that many of us avoid the guns with the lock, but the idea that it's going to lock itself up under fire/recoil/gunfight are just not it. It's so unlikely to actually happen or be a concern that it's just not an issue.
I prefer some of the older revolvers. Some are for "tangible" reasons that can be argued (and do get argued!) and some are simply because I have an affection for the guns that were on the market when I became a shooter.
But I can sit here and claim with full honesty that I have none, zero, ZILCH of a concern that a Smith & Wesson revolver equipped with the lock is going to lock itself up on me.
And FWIW, I've done a fair bit of shooting with both the .460 and .500 S&W Magnum revolvers, and it's never happened on either of those that I've been shooting, either. THAT'S some recoil.