I don't believe in carrying a MICRO size handgun in any caliber for self-defense. I am also not a supporter of pocket carry that is so popular on this forum.
Perhaps it is your use of the click-bait word MICRO that causes me to vote no. You don't describe what you consider to be MICRO size but mention the SIG P365 which doesn't meet my definition of MICRO.
Whether we like it or not, the Sig P365 has become the standard for what the market considers "micro-compact".
That said, there are many here and on other forums who buy such pistols and immediately complain that their micro gun is so small its size makes it difficult for them to shoot easily. Really? What did they expect to happen? Next thing they are fitting bigger mags to extend the grip, or an entirely different grip frame (if the gun is modular) to bring the gun up to subcompact size, usually at considerable expense. Just leaves me shaking my head, especially when there is a perfectly functional sub-compact class gun available, often for less money.
It's real simple for me: if I cannot shoot a particular pistol with hanging pinky, I don't buy it. Either because of the pistol's superior design or some skill on my part (you decide

) I can shoot a Walther PPS M2 quite well with the short magazine and my pinky dangling. Do I shoot better with the longer mag and full grip? Of course, but there's a trade-off to be made between shootability and concealment.
Getting back on topic, building a micro-compact DA/SA pistol to suit US tastes is hard, and maybe impossible. I say this because the older, very small guns I can think of that are DA/SA all use a device many on here consider the work of the Devil. I speak of the
slide mounted decocker/safety, a device known to create much fear and loathing across the US.
Well, it all comes down to space. If you take a 1" wide gun (the standard for "micro") and design with a locked breech, a hammer and require DA/SA operation, at some point all the linkages and gee-jaws required mean that you run out of space for the safety lever(s) and a shaft to pivot on. In the past, the standard European fix was the slide mounted safety. See Walther PP/PPK and clones. Heck, look at the number of larger guns that went down that road, Ruger P94/95, Beretta 92, S&W 3rd gens. The only gun I can think of that gets close is the CZ RAMI, and that uses a either a safety with no decocker or a decocker only, and is 1.3" inches thick. After some looking around it becomes easy to see why small guns these days are nearly all striker fired and made of polymer.