Very well stated, John. My experiences with shotguns include just about an even ratio of single-trigger two-barreled guns to double- triggered two-barreled guns. I have shot Beretta and Perazzi O/Us extensively with never a malfunction from either brand. Tens of thousands of rounds in two each of Berettta and Perazzi. High volume doves and sporting competition. I have shot two BSS doubles extensively with never a trigger malfunction in either. I now shoot a Hunter One Trigger a lot, with no malfunctions so far. Pretty decent record so far, eh?
All trigger malfunctions I have ever experienced have come with double triggered guns that would double fire. The most recent, an Italian sidelock hammergun of modern manufacture.
This has not turned me against double triggers. I was raised on a double trigger, and still enjoy using them. I can switch back and forth from single to double without any conscious thought. It just happens for me. But, I think the ability to instantly choose chokes with double triggers is terribly over-rated.
MM was also the writer that claimed that chokes were obsolete with modern ammunition. IMO, quoting him in order to help prove a position is wasted time. He was right about a great deal of things, but his writings were one thing only, HIS opinions. Being able to state them well does not add credulity to his positions, nor take away from them, for that matter.
When I HAVE witnessed a failure with a single trigger on a modern O/U it has almost invariably been a Browning. Not casting stones at Brownings, just an observation.
SRH