Oh please. You can drop a cocked S&W on the ground and as long as it does not land on the hammer spur it will not fire. Most of my Smiths (over 40 of them) have single action trigger pulls of around 2 1/2 pounds.
Not that I want to drop any of them, I wouldnt have wanted to bet the hammer wouldnt drop on my 29 with the hammer cocked, if it were dropped. The trigger was very light, and the hammer could be dropped without pulling the trigger, by simply pushing it down with your thumb. This was a factory trigger too. Ive seen a few other S&W's like that over the years as well.
Not that it really matters, as, unlike older SA's, they wont fire if the trigger isnt pulled and held.
DA may work at 5 yards for a classic frontal thorax shot but you don't know that's the hand you will be dealt.
I can't be head shot accurate double action other than maybe Bowie knife range. With single action I can hit a head at 25 yards even with some snubs.
You can be head shot accurate, and even better, with a good attitude and a little practice. If youre convinced you "cant", you likely never will.
Even with my eyes starting to go now, with deliberation, I can still consistently make head shots at 25 yards with my 642's and 2" 19. The 4" guns are a bit easier, but its not that difficult with the snubbies. These are all box stock guns to, no trigger work.
As I said earlier, it was the heavy recoil of the .44, and the flinching issue from anticipation with the super light SA trigger that got me started shooting DA. Knowing that super light SA trigger would go with the slightest touch, was not a help at all, and really a detriment.
DAO took my focus away from the trigger, and put it where it belonged, on the sights, and maintaining alignment until the shot "unexpectedly" broke, something that those light SA triggers really dont give you.
Once I became accustomed to shooting DAO, and my muscle tone and tecnique picked up, the flinch was gone, and my groups shrank considerably. I found I did better with all my DA guns shooting DAO, and I also found my shooting overall (rifle, pistol, even open bolt SMG's) improved, as I became less reliant/focused on my triggers, and focused on the sights/targets.
With practice (like anything else) longer ranges are not an issue either. I used to hunt chucks out to 100 yards with both the 29, and my one 28, both 4" guns, and we practiced regularly at 100 yards with the old "Hi C" juice cans and clay pigeons, mostly from a between the knees seated position, and consistent hits, cans or chucks, were not a problem. Trying to sneak up on the chucks and shooting them up close, was a lot more fun though.