I'm not convinced that it's time to revert from the Mozambique Drill to Hose Technique, just because they use the Mozambique Drill a lot in competition.
Michael's assertion that the "Two in the chest and one in the head" reflex came from competition is true. But the REASON it entered competition was that it came from a real incident in the late Rhodesian conflict (across the border in Mozambique, actually). The "Hammer to COM, re-assess, then deliver a head-shot if necessary" has evolved into transitioning from the first two COM shots directly and immediately to the head-shot if the target is still up. If the target is still up, there's no need to pause to "re-assess."
So the Mozambique Drill is currently "competition-based" - but it originally came about due to the repeated failure (in the field) of simply emptying the magazine to COM. That was often with 9mm Ball - but the point was that if a couple of good COM hits didn't work, something else was called for (whether the failure was due to armor, drugs, adreneline, momentum, et cetera). A major power-factor load delivered through the ocular window is likely to work.
I had some fun with Gunsite's Charging Robot, using G-18 mags in a G-17. It's just a robot, though, and only stops when the operator stops it. While the fountain of brass spewing out the ejection port was amusing, I'm not sure that there'd be much advantage to continuing to pour rounds into COM after the first few had failed to stop the assailant. With deeply penetrative loads, COM hits will disrupt the spine - but the head is a wider target than the back-bone, and easier to visualize from in front of the assailant. And possibly easier to hit.