I promised myself I wouldn't get sucked into these discussions anymore, but I'm bloated and a bit buzzed after Christmas dinner.
Regardless of the system, safe operation depends on training, and awareness of your own personal tendencies.
SA with safety requires a LOT of repetition to the point that flicking the safety off on presentation is automatic, and flicking it back on when the threat is gone is just as automatic. It also means not keeping any oddball guns around where the operation is the opposite of the rest of your guns (flicking 'up' to fire instead of down, for example).
DA/SA with decocker means mastering that DA pull until you're consistently hitting the 10 ring from prrsentation at 10 yards (so that you'll probably be able to hit the same target under stress at 5 yards) . That's probably no problem for the revolver guys, but for everyone else, it means lots of hours and lots of money on ammo. Unless you carry on an empty chamber, failing to train in DA is both dangerous and irresponsible.
Light strikers require perfect trigger discipline. That means making sure you don't touch off a round while transitioning from position 4 to 5, and keeping your finger off the trigger except for when you're definitely going to fire. This means training a negative, which is a lot harder than I think most people realize. It's easier to reinforce yourself to do things that result in you getting a shot on target (which rewards you) than with an action that results in no targets hit.
I prefer DA/SA with a decocker because that's where my instinctive tendencies reinforce the training; that won't be the same with everyone. If you put the hours in, any of these styles will be safe and effective; if you don't put the hours in, you will be a danger to yourself and others regardless of the mechanics.
I think this is a pretty good summary. The only comment I would make is you only mention the need to keep your finger off the trigger with striker fired guns. A finger on the trigger when it's not supposed to be is dangerous whether it's a 10 lb. or a 5 lb. pull. If you're training to the extent you mention with DA/SA then that 10 lb. DA isn't going to slow you down or require that concentrated of an effort, because if it did then you wouldn't make the accuracy requirement you give. While I agree that in terms of physics that the DA takes more force, we constantly hear that when flooded with adrenaline folks rarely if ever remember the physical force required to press that trigger. Usually it's a decision and then bang.
This is not me trying to say DA/SA is bad or striker fired pistols don't have any negatives. This is me saying I've seen people develop bad habits with all systems and that can include using the "safety" in a design as a sort of excuse to skirt the standard laws of firearm safety. In this case keeping the finger on the trigger when it's not supposed to be. I do agree with what I think is your main point that striker fired pistols have less margin in terms of poor/careless handling, I just don't want folks to think the other designs shouldn't involve the same level of concern.