Without going too far into it, no wheelgun has a decocker or safety (well there are rare instances of the latter, and I emphasize rare) - They're still practically the most idiot-proof in terms of pointing and shooting. I do grant the reloads is an issue, but then again, it can be one anyway. Indeed that and the rest of your points I could argue to varying levels in regards to semiautos. But in interests of not derailing this, I'll not for now.
So where were we?
Oh yeah, new SIG adoption.
I had heard one of things was the modularity and thus easy allowance of the use of different calibers, though as I understand it, 9mm will still be the standard, so honestly I'm not seeing too much the point of having a whole new/other sidearm, in that regard. Unless I'm mistaken about something here.