Wouldn't be my choice, but a few minutes of practice at the Israeli approach got my 1st shot down to some small fraction of a second longer than from C1.Empty-chamber carry is like thumb-cocking your revolver with the off hand; how do you know you'll have both hands available?
The Israelis adopted empty chamber carry for consistency in training; they have so many different guns, with different action types, and so many people of varying experience and skill level carrying, that draw-rack-shoot was adopted as standard for all auto pistols. In that context, it's not a bad plan.
You nail it on the one-hand operation aspect: operating the slide one-handed is slower* and also at best it's riskier. That even knowing how to do it and planning for it being needed (e.g. wounded, slide-lock, active threats) AND more than a few minutes of practice.
*- slower because it takes attention to avoid violating rule #1 ... maybe I'd be faster at it while under active threat.